public CustomPopupPlacement[] PlacePopup(Size popupSize,
Size targetSize,
Point offset)
{
var p = TextButton.PointToScreen(new Point(0, 0));
var placement1 =
new CustomPopupPlacement(new Point(p.X + TextButton.ActualWidth / 2 - popupSize.Width / 2, p.Y - popupSize.Height), PopupPrimaryAxis.Vertical);
var placement2 =
new CustomPopupPlacement(new Point(10, 20), PopupPrimaryAxis.Horizontal);
var ttplaces =
new CustomPopupPlacement[] { placement1 };
return(ttplaces);
}