Having Trouble Setting Window's Owner in Parent's Constructor

Question

Is there anything wrong in WPF with setting the Owner property of a window to its parent in that parent\'s constructor? There shouldn\'t be, right? So why am I getting an

Answer 1

You need the WPF equivalent of HandleCreated event, which is SourceInitialized. This should work:

public OwnerWindow()
{
    InitializeComponent();

    SourceInitialized += (s, a) =>
        {
            var owned = new OwnedWindow();
            owned.Owner = this;
        };
}

Note that you don't have to Show either OwnerWindow or OwnedWindow for this to work.