protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
var selectedItem = ((System.Windows.FrameworkElement)e.OriginalSource).DataContext;
this.OnItemSingleClickHandler(this, ItemMouseSingleClickEventArgs <object> .ItemSingleClick(selectedItem));
base.OnMouseLeftButtonDown(e);
}
private void Item_OnClickHandler(object sender, ItemMouseSingleClickEventArgs <object> e)
{
NumberBoxItem item = sender as NumberBoxItem;
this.SelectedItem = item.Content;
}