public static MessageBoxResult Show()
{
_popup = new Popup();
_camCrosshair = new CameraCrosshair();
double screenWidth = Application.Current.Host.Content.ActualWidth;
double screenHeight = Application.Current.Host.Content.ActualHeight;
_camCrosshair.Margin = new Thickness((screenWidth / 2) - 160, (screenHeight / 2) - 160, 0, 0);
_popup.Child = _camCrosshair;
_popup.IsOpen = true;
return(MessageBoxResult.Cancel);
}