/// <summary>
/// HeaderTemplate property changed handler
/// </summary>
/// <param name="d">TabItem that changed its HeaderTemplate.</param>
/// <param name="e">DependencyPropertyChangedEventArgs.</param>
private static void OnHeaderTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TabItem ctrl = (TabItem)d;
ctrl.OnHeaderTemplateChanged((DataTemplate)e.OldValue, (DataTemplate)e.NewValue);
}