/// <summary>
/// Helper method which determines if any of the elements of
/// the tree is focusable and has tab stop
/// </summary>
public static bool TreeHasFocusAndTabStop(DependencyObject element)
{
if (element == null)
{
return(false);
}
UIElement uielement = element as UIElement;
if (uielement != null)
{
if (uielement.Focusable && KeyboardNavigation.GetIsTabStop(uielement))
{
return(true);
}
}
else
{
ContentElement contentElement = element as ContentElement;
if (contentElement != null && contentElement.Focusable && KeyboardNavigation.GetIsTabStop(contentElement))
{
return(true);
}
}
int childCount = VisualTreeHelper.GetChildrenCount(element);
for (int i = 0; i < childCount; i++)
{
DependencyObject child = VisualTreeHelper.GetChild(element, i) as DependencyObject;
if (TreeHasFocusAndTabStop(child))
{
return(true);
}
}
return(false);
}
