public static void AllVisualDescendents <T>(this FrameworkElement element, Action <FrameworkElement> action) where T : FrameworkElement
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
{
FrameworkElement frameworkElement = (FrameworkElement)VisualTreeHelper.GetChild(element, i);
if (frameworkElement is T)
{
action(frameworkElement);
}
frameworkElement.AllVisualDescendents(action);
}
}