diff --git a/color_windows.go b/color_windows.go
index 4b98420..66761dc 100644
--- a/color_windows.go
+++ b/color_windows.go
@@ -41,7 +41,7 @@ func selectColor(opts options) (color.Color, error) {
 		args.Flags |= win.CC_FULLOPEN
 	}
 
-	defer setup()()
+	defer setup(args.Owner)()
 	unhook, err := hookDialog(opts.ctx, opts.windowIcon, opts.title, nil)
 	if err != nil {
 		return nil, err
diff --git a/date_windows.go b/date_windows.go
index c57da55..188347d 100644
--- a/date_windows.go
+++ b/date_windows.go
@@ -37,7 +37,8 @@ type calendarDialog struct {
 }
 
 func (dlg *calendarDialog) setup(text string, opts options) (time.Time, error) {
-	defer setup()()
+	owner, _ := opts.attach.(win.HWND)
+	defer setup(owner)()
 	dlg.font = getFont()
 	defer dlg.font.delete()
 	icon := getIcon(opts.windowIcon)
@@ -58,7 +59,6 @@ func (dlg *calendarDialog) setup(text string, opts options) (time.Time, error) {
 	}
 	defer win.UnregisterClass(cls, instance)
 
-	owner, _ := opts.attach.(win.HWND)
 	dlg.wnd, _ = win.CreateWindowEx(_WS_EX_ZEN_DIALOG,
 		cls, strptr(*opts.title), _WS_ZEN_DIALOG,
 		win.CW_USEDEFAULT, win.CW_USEDEFAULT,
diff --git a/entry_windows.go b/entry_windows.go
index 0c54628..0bc30ea 100644
--- a/entry_windows.go
+++ b/entry_windows.go
@@ -36,7 +36,8 @@ type entryDialog struct {
 }
 
 func (dlg *entryDialog) setup(text string, opts options) (string, error) {
-	defer setup()()
+	owner, _ := opts.attach.(win.HWND)
+	defer setup(owner)()
 	dlg.font = getFont()
 	defer dlg.font.delete()
 	icon := getIcon(opts.windowIcon)
@@ -57,7 +58,6 @@ func (dlg *entryDialog) setup(text string, opts options) (string, error) {
 	}
 	defer win.UnregisterClass(cls, instance)
 
-	owner, _ := opts.attach.(win.HWND)
 	dlg.wnd, _ = win.CreateWindowEx(_WS_EX_ZEN_DIALOG,
 		cls, strptr(*opts.title), _WS_ZEN_DIALOG,
 		win.CW_USEDEFAULT, win.CW_USEDEFAULT,
diff --git a/file_windows.go b/file_windows.go
index 5977ad8..a059a57 100644
--- a/file_windows.go
+++ b/file_windows.go
@@ -36,7 +36,7 @@ func selectFile(opts options) (string, error) {
 	args.MaxFile = uint32(len(res))
 	args.InitialDir, args.DefExt = initDirNameExt(opts.filename, res[:])
 
-	defer setup()()
+	defer setup(args.Owner)()
 	unhook, err := hookDialog(opts.ctx, opts.windowIcon, nil, nil)
 	if err != nil {
 		return "", err
@@ -79,7 +79,7 @@ func selectFileMultiple(opts options) ([]string, error) {
 	args.MaxFile = uint32(len(res))
 	args.InitialDir, args.DefExt = initDirNameExt(opts.filename, res[:])
 
-	defer setup()()
+	defer setup(args.Owner)()
 	unhook, err := hookDialog(opts.ctx, opts.windowIcon, nil, nil)
 	if err != nil {
 		return nil, err
@@ -153,7 +153,7 @@ func selectFileSave(opts options) (string, error) {
 	args.MaxFile = uint32(len(res))
 	args.InitialDir, args.DefExt = initDirNameExt(opts.filename, res[:])
 
-	defer setup()()
+	defer setup(args.Owner)()
 	unhook, err := hookDialog(opts.ctx, opts.windowIcon, nil, nil)
 	if err != nil {
 		return "", err
@@ -171,7 +171,8 @@ func selectFileSave(opts options) (string, error) {
 }
 
 func pickFolders(opts options, multi bool) (string, []string, error) {
-	defer setup()()
+	owner, _ := opts.attach.(win.HWND)
+	defer setup(owner)()
 
 	err := win.CoInitializeEx(0, win.COINIT_APARTMENTTHREADED|win.COINIT_DISABLE_OLE1DDE)
 	if err != win.RPC_E_CHANGED_MODE {
@@ -230,7 +231,6 @@ func pickFolders(opts options, multi bool) (string, []string, error) {
 		defer unhook()
 	}
 
-	owner, _ := opts.attach.(win.HWND)
 	err = dialog.Show(owner)
 	if opts.ctx != nil && opts.ctx.Err() != nil {
 		return "", nil, opts.ctx.Err()
diff --git a/internal/win/comctl32.go b/internal/win/comctl32.go
index ea58ca8..0e96494 100644
--- a/internal/win/comctl32.go
+++ b/internal/win/comctl32.go
@@ -3,6 +3,7 @@
 package win
 
 const (
+	// InitCommonControlsEx flags
 	ICC_LISTVIEW_CLASSES   = 0x00000001
 	ICC_TREEVIEW_CLASSES   = 0x00000002
 	ICC_BAR_CLASSES        = 0x00000004
diff --git a/internal/win/comdlg32.go b/internal/win/comdlg32.go
index 60da766..fb1cf53 100644
--- a/internal/win/comdlg32.go
+++ b/internal/win/comdlg32.go
@@ -9,6 +9,7 @@ import (
 )
 
 const (
+	// ChooseColor flags
 	CC_RGBINIT         = 0x00000001
 	CC_FULLOPEN        = 0x00000002
 	CC_PREVENTFULLOPEN = 0x00000004
diff --git a/internal/win/kernel32.go b/internal/win/kernel32.go
index 0f87f2c..7f44fe7 100644
--- a/internal/win/kernel32.go
+++ b/internal/win/kernel32.go
@@ -5,6 +5,7 @@ package win
 import "golang.org/x/sys/windows"
 
 const (
+	// CreateActCtx flags
 	ACTCTX_FLAG_PROCESSOR_ARCHITECTURE_VALID = 0x001
 	ACTCTX_FLAG_LANGID_VALID                 = 0x002
 	ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID     = 0x004
@@ -12,6 +13,13 @@ const (
 	ACTCTX_FLAG_SET_PROCESS_DEFAULT          = 0x010
 	ACTCTX_FLAG_APPLICATION_NAME_VALID       = 0x020
 	ACTCTX_FLAG_HMODULE_VALID                = 0x080
+
+	// Control signals
+	CTRL_C_EVENT        = 0
+	CTRL_BREAK_EVENT    = 1
+	CTRL_CLOSE_EVENT    = 2
+	CTRL_LOGOFF_EVENT   = 5
+	CTRL_SHUTDOWN_EVENT = 6
 )
 
 // https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-actctxw
@@ -33,6 +41,7 @@ func GetSystemDirectory() (string, error) { return windows.GetSystemDirectory()
 //sys ActivateActCtx(actCtx Handle, cookie *uintptr) (err error) = kernel32.ActivateActCtx
 //sys CreateActCtx(actCtx *ACTCTX) (ret Handle, err error) = kernel32.CreateActCtxW
 //sys DeactivateActCtx(flags uint32, cookie uintptr) (err error) = kernel32.DeactivateActCtx
+//sys GenerateConsoleCtrlEvent(ctrlEvent uint32, processGroupId int) (err error) = kernel32.GenerateConsoleCtrlEvent
 //sys GetConsoleWindow() (ret HWND) = kernel32.GetConsoleWindow
 //sys GetModuleHandle(moduleName *uint16) (ret Handle, err error) = kernel32.GetModuleHandleW
 //sys ReleaseActCtx(actCtx Handle) = kernel32.ReleaseActCtx
diff --git a/internal/win/shell32.go b/internal/win/shell32.go
index 829a632..0a05e2f 100644
--- a/internal/win/shell32.go
+++ b/internal/win/shell32.go
@@ -71,6 +71,7 @@ const (
 	FOS_FORCEPREVIEWPANEON       = 0x40000000
 	FOS_SUPPORTSTREAMABLEITEMS   = 0x80000000
 
+	// IShellItem.GetDisplayName forms
 	SIGDN_NORMALDISPLAY               = 0x00000000
 	SIGDN_PARENTRELATIVEPARSING       = ^(^0x18001 + 0x80000000)
 	SIGDN_DESKTOPABSOLUTEPARSING      = ^(^0x28000 + 0x80000000)
diff --git a/internal/win/zsyscall_windows.go b/internal/win/zsyscall_windows.go
index 4ac75dd..d28d2ae 100644
--- a/internal/win/zsyscall_windows.go
+++ b/internal/win/zsyscall_windows.go
@@ -58,6 +58,7 @@ var (
 	procActivateActCtx               = modkernel32.NewProc("ActivateActCtx")
 	procCreateActCtxW                = modkernel32.NewProc("CreateActCtxW")
 	procDeactivateActCtx             = modkernel32.NewProc("DeactivateActCtx")
+	procGenerateConsoleCtrlEvent     = modkernel32.NewProc("GenerateConsoleCtrlEvent")
 	procGetConsoleWindow             = modkernel32.NewProc("GetConsoleWindow")
 	procGetModuleHandleW             = modkernel32.NewProc("GetModuleHandleW")
 	procReleaseActCtx                = modkernel32.NewProc("ReleaseActCtx")
@@ -179,6 +180,14 @@ func DeactivateActCtx(flags uint32, cookie uintptr) (err error) {
 	return
 }
 
+func GenerateConsoleCtrlEvent(ctrlEvent uint32, processGroupId int) (err error) {
+	r1, _, e1 := syscall.Syscall(procGenerateConsoleCtrlEvent.Addr(), 2, uintptr(ctrlEvent), uintptr(processGroupId), 0)
+	if r1 == 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
 func GetConsoleWindow() (ret HWND) {
 	r0, _, _ := syscall.Syscall(procGetConsoleWindow.Addr(), 0, 0, 0, 0)
 	ret = HWND(r0)
diff --git a/internal/zencmd/process_windows.go b/internal/zencmd/process_windows.go
index f279430..bf9cebf 100644
--- a/internal/zencmd/process_windows.go
+++ b/internal/zencmd/process_windows.go
@@ -1,4 +1,8 @@
 package zencmd
 
+import "github.com/ncruces/zenity/internal/win"
+
 // KillParent is internal.
-func KillParent() {}
+func KillParent() {
+	win.GenerateConsoleCtrlEvent(win.CTRL_BREAK_EVENT, 0)
+}
diff --git a/internal/zencmd/window_windows.go b/internal/zencmd/window_windows.go
index 24ff5fe..69ed78d 100644
--- a/internal/zencmd/window_windows.go
+++ b/internal/zencmd/window_windows.go
@@ -3,6 +3,7 @@ package zencmd
 import (
 	"strconv"
 
+	"github.com/ncruces/zenity/internal/win"
 	"golang.org/x/sys/windows"
 )
 
@@ -13,6 +14,6 @@ func ParseWindowId(id string) windows.HWND {
 }
 
 // GetParentWindowId is internal.
-func GetParentWindowId(pid int) int {
-	return 0
+func GetParentWindowId(pid int) windows.HWND {
+	return win.GetConsoleWindow()
 }
diff --git a/list_windows.go b/list_windows.go
index 3daa229..a9245b9 100644
--- a/list_windows.go
+++ b/list_windows.go
@@ -53,7 +53,8 @@ type listDialog struct {
 }
 
 func (dlg *listDialog) setup(text string, opts options) ([]string, error) {
-	defer setup()()
+	owner, _ := opts.attach.(win.HWND)
+	defer setup(owner)()
 	dlg.font = getFont()
 	defer dlg.font.delete()
 	icon := getIcon(opts.windowIcon)
@@ -74,7 +75,6 @@ func (dlg *listDialog) setup(text string, opts options) ([]string, error) {
 	}
 	defer win.UnregisterClass(cls, instance)
 
-	owner, _ := opts.attach.(win.HWND)
 	dlg.wnd, _ = win.CreateWindowEx(_WS_EX_ZEN_DIALOG,
 		cls, strptr(*opts.title), _WS_ZEN_DIALOG,
 		win.CW_USEDEFAULT, win.CW_USEDEFAULT,
diff --git a/msg_windows.go b/msg_windows.go
index 988311f..b78bee7 100644
--- a/msg_windows.go
+++ b/msg_windows.go
@@ -52,7 +52,8 @@ func message(kind messageKind, text string, opts options) error {
 		}
 	}
 
-	defer setup()()
+	owner, _ := opts.attach.(win.HWND)
+	defer setup(owner)()
 	unhook, err := hookMessageDialog(opts)
 	if err != nil {
 		return err
@@ -64,7 +65,6 @@ func message(kind messageKind, text string, opts options) error {
 		title = strptr(*opts.title)
 	}
 
-	owner, _ := opts.attach.(win.HWND)
 	s, err := win.MessageBox(owner, strptr(text), title, flags)
 
 	if opts.ctx != nil && opts.ctx.Err() != nil {
diff --git a/progress_windows.go b/progress_windows.go
index 4828c1a..4485e26 100644
--- a/progress_windows.go
+++ b/progress_windows.go
@@ -116,7 +116,8 @@ func (dlg *progressDialog) setup(opts options) error {
 	var once sync.Once
 	defer once.Do(dlg.init.Done)
 
-	defer setup()()
+	owner, _ := opts.attach.(win.HWND)
+	defer setup(owner)()
 	dlg.font = getFont()
 	defer dlg.font.delete()
 	icon := getIcon(opts.windowIcon)
@@ -137,7 +138,6 @@ func (dlg *progressDialog) setup(opts options) error {
 	}
 	defer win.UnregisterClass(cls, instance)
 
-	owner, _ := opts.attach.(win.HWND)
 	dlg.wnd, _ = win.CreateWindowEx(_WS_EX_ZEN_DIALOG,
 		cls, strptr(*opts.title), _WS_ZEN_DIALOG,
 		win.CW_USEDEFAULT, win.CW_USEDEFAULT,
diff --git a/pwd_windows.go b/pwd_windows.go
index 4315dab..9e915a0 100644
--- a/pwd_windows.go
+++ b/pwd_windows.go
@@ -46,7 +46,8 @@ type passwordDialog struct {
 }
 
 func (dlg *passwordDialog) setup(opts options) (string, string, error) {
-	defer setup()()
+	owner, _ := opts.attach.(win.HWND)
+	defer setup(owner)()
 	dlg.font = getFont()
 	defer dlg.font.delete()
 	icon := getIcon(opts.windowIcon)
@@ -67,7 +68,6 @@ func (dlg *passwordDialog) setup(opts options) (string, string, error) {
 	}
 	defer win.UnregisterClass(cls, instance)
 
-	owner, _ := opts.attach.(win.HWND)
 	dlg.wnd, _ = win.CreateWindowEx(_WS_EX_ZEN_DIALOG,
 		cls, strptr(*opts.title), _WS_ZEN_DIALOG,
 		win.CW_USEDEFAULT, win.CW_USEDEFAULT,
diff --git a/util_unix.go b/util_unix.go
index f427127..111cd47 100644
--- a/util_unix.go
+++ b/util_unix.go
@@ -5,7 +5,6 @@ package zenity
 import (
 	"bytes"
 	"os/exec"
-	"reflect"
 	"strconv"
 	"strings"
 
@@ -99,10 +98,6 @@ func pwdResult(sep string, opts options, out []byte, err error) (string, string,
 	return "", str, err
 }
 
-func hwnd(v reflect.Value) uintptr {
-	return uintptr(v.Uint())
-}
-
 // Replace with strings.Cut after 1.18.
 func cut(s, sep string) (before, after string, found bool) {
 	if i := strings.Index(s, sep); i >= 0 {
diff --git a/util_windows.go b/util_windows.go
index e7e61cb..581afcc 100644
--- a/util_windows.go
+++ b/util_windows.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"os"
-	"reflect"
 	"runtime"
 	"strconv"
 	"sync"
@@ -26,13 +25,10 @@ const (
 func intptr(i int64) uintptr  { return uintptr(i) }
 func strptr(s string) *uint16 { return syscall.StringToUTF16Ptr(s) }
 
-func hwnd(v reflect.Value) win.HWND {
-	return win.HWND(uintptr(v.Uint()))
-}
-
-func setup() context.CancelFunc {
-	var wnd win.HWND
-	win.EnumWindows(syscall.NewCallback(setupEnumCallback), unsafe.Pointer(&wnd))
+func setup(wnd win.HWND) context.CancelFunc {
+	if wnd == 0 {
+		win.EnumWindows(syscall.NewCallback(setupEnumCallback), unsafe.Pointer(&wnd))
+	}
 	if wnd == 0 {
 		wnd = win.GetConsoleWindow()
 	}
diff --git a/zenity.go b/zenity.go
index 8056c08..caefe0f 100644
--- a/zenity.go
+++ b/zenity.go
@@ -13,8 +13,6 @@ package zenity
 import (
 	"context"
 	"image/color"
-	"reflect"
-	"runtime"
 	"time"
 
 	"github.com/ncruces/zenity/internal/zenutil"
@@ -191,38 +189,6 @@ func CustomIcon(path string) Option {
 	return Icon(path)
 }
 
-// Attach returns an Option to set the parent window to attach to.
-//
-// Attach accepts:
-//  - a window id (int) on Unix
-//  - a window handle (~uintptr) on Windows
-//  - an application name (string) or process id (int) on macOS
-func Attach(id any) Option {
-	switch runtime.GOOS {
-	case "windows":
-		if v := reflect.ValueOf(id); v.Kind() == reflect.Uintptr {
-			id = hwnd(v)
-		} else {
-			panic("interface conversion: expected uintptr")
-		}
-
-	case "darwin":
-		switch id.(type) {
-		case int, string:
-		default:
-			panic("interface conversion: expected int or string")
-		}
-
-	default:
-		switch id.(type) {
-		case int:
-		default:
-			panic("interface conversion: expected int")
-		}
-	}
-	return funcOption(func(o *options) { o.attach = id })
-}
-
 // Modal returns an Option to set the modal hint.
 func Modal() Option {
 	return funcOption(func(o *options) { o.modal = true })
diff --git a/zenity_darwin.go b/zenity_darwin.go
new file mode 100644
index 0000000..e4b40c7
--- /dev/null
+++ b/zenity_darwin.go
@@ -0,0 +1,16 @@
+package zenity
+
+// Attach returns an Option to set the parent window to attach to.
+//
+// Attach accepts:
+//  - a window id (int) on Unix
+//  - a window handle (~uintptr) on Windows
+//  - an application name (string) or process id (int) on macOS
+func Attach(id any) Option {
+	switch id.(type) {
+	case int, string:
+	default:
+		panic("interface conversion: expected int or string")
+	}
+	return funcOption(func(o *options) { o.attach = id })
+}
diff --git a/zenity_unix.go b/zenity_unix.go
new file mode 100644
index 0000000..45fd72b
--- /dev/null
+++ b/zenity_unix.go
@@ -0,0 +1,13 @@
+//go:build !windows && !darwin
+
+package zenity
+
+// Attach returns an Option to set the parent window to attach to.
+//
+// Attach accepts:
+//  - a window id (int) on Unix
+//  - a window handle (~uintptr) on Windows
+//  - an application name (string) or process id (int) on macOS
+func Attach(id int) Option {
+	return funcOption(func(o *options) { o.attach = id })
+}
diff --git a/zenity_windows.go b/zenity_windows.go
new file mode 100644
index 0000000..0344381
--- /dev/null
+++ b/zenity_windows.go
@@ -0,0 +1,22 @@
+package zenity
+
+import (
+	"reflect"
+
+	"github.com/ncruces/zenity/internal/win"
+)
+
+// Attach returns an Option to set the parent window to attach to.
+//
+// Attach accepts:
+//  - a window id (int) on Unix
+//  - a window handle (~uintptr) on Windows
+//  - an application name (string) or process id (int) on macOS
+func Attach(id any) Option {
+	if v := reflect.ValueOf(id); v.Kind() == reflect.Uintptr {
+		id = win.HWND(uintptr(v.Uint()))
+	} else {
+		panic("interface conversion: expected uintptr")
+	}
+	return funcOption(func(o *options) { o.attach = id })
+}