WPF WindowStartupLocation=“CenterOwner” not really center, and pops all over, why?

Question

Well this question and this question are similar but no answers that work. In fact I was hoping WindowStartupLocation=CenterOwner would work...it doesn\'t. It seems to cent

Answer 1

If you create an extention for this, you could reuse this fine idea:

/// 

/// Opens a window modally, with an owner
/// 
/// The window to open
/// The owner of the window getting opened
/// window.ShowDialog()
public static bool? ShowDialog(this Window window, Window opener)
{
    window.Owner = opener;
    return window.ShowDialog();
}