//焦点消失
private void txtUc_LostFocus(object sender, RoutedEventArgs e) //todo:仍不完美，焦点移除该控件后不能使之消失
{
if (dgUc.CaptureMouse() || dpUc.CaptureMouse())
{
return;
}
dgUc.Visibility = Visibility.Collapsed;
dpUc.Visibility = Visibility.Collapsed;
}