BringToFrontAfterShowDialog

LoginPopup.xaml.cs

  // consider doing this in the Load or Window_ContentRendered events instead
  // options to clean up temporary things like frontmost could be done in Window_Initialized
  // using options from http://stackoverflow.com/questions/257587/bring-a-window-to-the-front-in-wpf
  public new bool? ShowDialog()
  {
    var t = new System.Threading.Tasks.Task(() =>
    {
      // wait for the window to show from show dialog
      Task.Delay(1000);
      try
      {
          this.Dispatcher.Invoke(() =>
          {
              this.Activate();
              this.Topmost = true;
              this.Topmost = false;
              this.Focus();
          });
      }
      catch (Exception ex)
      {
        // log exception if desired.
      }
    });
    t.Start();
    return base.ShowDialog();
  }