private void OnClickSave(object sender, RoutedEventArgs e)
{
DesignerItem item = new DesignerItem();
item.Style = this.TryFindResource("DesignerItemStyle") as Style;
item.Content = new Button()
{
IsHitTestVisible = false, Content = "China", Background = Brushes.Gray
};
item.Width = 100;
item.Height = 100;
item.SetValue(Canvas.LeftProperty, 10.0);
item.SetValue(Canvas.TopProperty, 10.0);
this.MyDesignerCanvas.Children.Add(item);
}