New to Telerik UI for WPF? Start a free 30-day trial

Setting Owner of RadWindow to Form Handle in UI for WPF

Updated on Mar 20, 2026

Environment

Product	UI for WPF RadWindow
Version	2026.1.211

Description

I want to use a Telerik UI for WPF RadWindow in a WinForms application and set its owner to the handle (IntPtr) of a WinForms form.

This knowledge base article also answers the following questions:

How to set the owner of RadWindow to a WinForms form's handle?
How to override GetWindowOwnerHandle in RadWindow?
How to enable modeless keyboard interop in RadWindow?

Solution

To set the owner of a Telerik UI for WPF RadWindow to a WinForms form's handle, follow these steps:

Derive a class from RadWindow and override the GetWindowOwnerHandle method.
Create a property in the derived class to store the owner's handle (IntPtr).
In the WinForms form, assign the handle to the RadWindow's OwnerHandle property prior to showing the window.

Example Code

Custom RadWindow Class

csharp

public partial class Window1 : RadWindow
{
    public Window1()
    {
        InitializeComponent();
    }

    protected override IntPtr GetWindowOwnerHandle()
    {
        return this.OwnerHandle;
    }

    public IntPtr OwnerHandle { get; set; }
}

WinForms Form Integration

csharp

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        var wpfwindow = new WpfCustomControlLibrary1.Window1();
        wpfwindow.HostCreated += (s, a) =>
        {
            ElementHost.EnableModelessKeyboardInterop(a.HostWindow);            
        };

        wpfwindow.OwnerHandle = this.Handle;
        wpfwindow.Show();
    }
}

Key Points

Override the GetWindowOwnerHandle method in the RadWindow-derived class to return the form's handle.
Use ElementHost.EnableModelessKeyboardInterop to enable keyboard interop for the WPF window.