Automatic tab in Silverlight 3

public static void TabNext(DependencyObject parentElement, Control fromControl)
{
 var children = VisualTreeHelperUtil.FindChildren(parentElement).
 Where(c => c.IsEnabled && c.IsTabStop && c.Visibility == Visibility.Visible).
 ToList();

 if (children.Contains(fromControl))
 {
 var thisIndex = children.IndexOf(fromControl);
 var targetIndex = thisIndex + 1;
 if (children.Count> targetIndex)
 {
 var targetChild = children[targetIndex];
 fromControl.Dispatcher.BeginInvoke(() =>
 {
 targetChild.Focus();
 var txt = targetChild as TextBox;
 if (txt != null)
 {
 txt.SelectAll();
 }
 });
 }
 }
}

I need to be able to automatically tab from a control to an SL3 application “Next control”. For example, the TextBox is limited to 3 characters-when typing the 3rd character, the focus should automatically move to the next control on the form (my actual usage is slightly different, but this example is sufficient)

However, since SL automatically determines the label sequence, there does not seem to be any other than reverse engineering/copying Silverlight’s logic to determine which control in the visual tree should be the next control to gain focus Ways to do this.

Has anyone achieved this before?

I am looking for a fairly general solution-but I have been able to do some fairly specific things-basically it uses VisualTreeHelper to find the The next control is a child of the same parent item, and set the focus to that.

This is a better fit than through all my controls (this is a fairly large LOB application) Solution and configure the “next” control for each control.

This is my code in case it helps others. (VisualTreeeHelperUtil is a class of my own, it adds for VisualTreeHelper Some utilities)

public static void TabNext(DependencyObject parentElement, Control fromControl)
{
 var children = VisualTreeHelperUtil.FindChildren(parentElement) .
 Where(c => c.IsEnabled && c.IsTabStop && c.Visibility == Visibility.Visible).
 ToList();

 if (children.Contains( fromControl))
 {
 var thisIndex = children.IndexOf(fromControl);
 var targetIndex = thisIndex + 1;
 if (children.Count> targetIndex)
 { 
 var targetChild = children[targetIndex];
 fromControl.Dispatcher.BeginInvoke(() =>
 {
 targetChild.Focus();
 va r txt = targetChild as TextBox;
 if (txt != null)
 {
 txt.SelectAll();
 }
 });
} 
 }
}