Accessing properties and objects in a DataTemplate is not as easy as you would think. Normally the Template is separated from the item that uses it. You can find the DataTemplate as a Resource, but you cannot use the VisualTreehelper on it.
DataTemplate dt = Application.Current.Resources[“TheDataTemplate”] as DataTemplate;
int count = VisualTreeHelper.GetChildrenCount(dt);
This leads to the error: Reference is not a valid visual DependencyObject.
The solution is to use the Loaded event of the outermost container, quite often a Grid and use FindName in the EventHandler to get to Objects inside the DataTemplate and to properties of those:
<Grid x:Name=”TheGrid” Grid.Row=”0″ Loaded=”TheGrid_Loaded”>
//Objects and properties are here…
//enabling buttons in DataTemplate when Oob en Elevated…
private void TheGrid_Loaded(object sender, RoutedEventArgs e)
Grid grd = sender as Grid;
if (grd != null)
Button c = grd.FindName(“btnCall”) as Button;
c.IsEnabled = true;
Button m = grd.FindName(“btnMail”) as Button;
m.IsEnabled = true;
Button p = grd.FindName(“btnCopy”) as Button;
p.IsEnabled = true;
Button v = grd.FindName(“btnVCard”) as Button;
v.IsEnabled = true;
Hope this helps! Njoy!