void SetDataContextSource (FrameworkElement fe)
{
if (DataContextSource != null)
DataContextSource.RemovePropertyChangedHandler (FrameworkElement.DataContextProperty, DataContextChanged);
DataContextSource = fe;
if (DataContextSource != null)
DataContextSource.AddPropertyChangedHandler (FrameworkElement.DataContextProperty, DataContextChanged);
// If a FrameworkElement binds to its own datacontext and the VisualParent is null, we end
// up here with a null DataContextSource. In this scenario we do not want to update.
if (DataContextSource != null || IsMentorDataContextBound)
PropertyPathWalker.Update (DataContextSource == null ? null : DataContextSource.DataContext);
}
void AttachDataContextHandlers (FrameworkElement mentor)
{
if (mentor != null)
mentor.AddPropertyChangedHandler (FrameworkElement.DataContextProperty, OnNativeMentorDataContextChangedSafe);
}
