Extend TabView in title bar in WinUI 3

I’m trying to to show TabView tabs in the title bar in WinUI 3. This could be done quite easily in UWP, but obviously some of these APIs are not available in WinUI. So I tried: this.ExtendsContentIntoTitleBar = true; tabViewFooter.MinWidth = 100; this.SetTitleBar(tabViewFooter); where “this” refers to main Window, but it doesn’t work properly. The window can be dragged and maximized / restored by double clicking but Minimize, Maximize and Close buttons don’t appear and the area where they should be is unresponsive to mouse events. If it worked, it wouldn’t be 100% correct anyway because, unlike the UWP sample, it uses a fixed width and doesn’t consider RTL layouts. Am I missing something?

[pratikone]

If you refer to the docs on custom titlebar, we recommend using simple UI elements like stackpanel or grid for custom titlebar element. Complex elements create ui layout issues. Also, any uielement set as custom titlebar cannot receive input because all the input is taken for titlebar operations like drag.

https://docs.microsoft.com/en-us/windows/winui/api/microsoft.ui.xaml.window.settitlebar?view=winui-3.0

I am closing this issue. If you got follow up question, feel free to re-open it.

[Sanlorng]

You can try this code (please check your winui version >= 1.0.0 experimental

create helper class

public static class AppWindowHandle
    {

        [DllImport("Microsoft.UI.Windowing.Core.dll", CharSet = CharSet.Unicode)]
        private static extern int GetWindowHandleFromWindowId(WindowId windowId, out IntPtr result);

        [DllImport("Microsoft.UI.Windowing.Core.dll", CharSet = CharSet.Unicode)]
        private static extern int GetWindowIdFromWindowHandle(IntPtr hwnd, out WindowId result);

        public static AppWindow GetAppWindow(this Microsoft.UI.Xaml.Window window)
        {
            IntPtr windowHandle = WinRT.Interop.WindowNative.GetWindowHandle(window);
            _ = GetWindowIdFromWindowHandle(windowHandle, out WindowId windowId);
            return AppWindow.GetFromWindowId(windowId);
        }
    }

using AppWindow.TitleBar.ExtendsContentToTitleBar

    public sealed partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();
            AppWindow appWindow = this.GetAppWindow();
            AppWindowTitleBar titleBar = appWindow.TitleBar;
            titleBar.ExtendsContentIntoTitleBar = true;
            titleBar.ButtonBackgroundColor = Colors.Transparent;
            SetTitleBar(CustomDragArea);
        }

    }