WPF modal window as tool window in WinForms disappears
.net, c#, windows, winforms, wpf
Solution
The use of `WindowsInteropHelper` allows you to wrap a hosted WPF-form using a Winforms-form and set its parent as a Winforms control, which prevents the WPF form from disappearing (as also pointed out by dowhilefor and Hans Passant)
E.g.:
// Use the interop helper for the specified wpf window hosted by the win32 owner
WindowInteropHelper wih = new WindowInteropHelper(wpfForm);
wih.Owner = this.someWin32FormsControl.Handle;
Problem
I was wondering if anyone can help me with this rather baffling situation. I have a WPF form `myForm` which I am displaying modally in a WinForm application (without using an ElementHost). Everything works fine if I use the default WindowStyle and it is shown in the taskbar. However now I don't want the form to show in the taskbar or contain the minimize button, therefore I have done the following: ``` MyForm myForm = new MyForm(); myForm.ShowInTaskbar = false; myForm.WindowStyle = System.Windows.WindowStyle.ToolWindow; myForm.WindowStartupLocation =System.Windows.WindowStartupLocation.CenterOwner; myForm.ShowDialog(); ``` Now, the wpf form displays as expected modally and without the minimize button. If I now select the "parent" winform application in the taskbar, the wpf form disappears and there doesn't seem to be any way of returning to it! I have read this which is similar but not the same (pure WPF application), so I can understand why the main app does not appear in the ALT+TAB menu, but can anyone tell me how I can return to the wpf form? Thanks in advance.