private static TreeItemDropBehavior GetAttachedBehavior(RadTreeViewItem treeViewItem)
{
if (!Instances.ContainsKey(treeViewItem))
{
Instances[treeViewItem] = new TreeItemDropBehavior {
AssociatedObject = treeViewItem
};
}
return(Instances[treeViewItem]);
}
public static void SetIsEnabled(DependencyObject obj, bool value)
{
var treeViewItem = obj.ParentOfType <RadTreeViewItem>();
TreeItemDropBehavior behavior = GetAttachedBehavior(treeViewItem);
behavior.AssociatedObject = treeViewItem;
if (value)
{
behavior.Initialize();
}
else
{
behavior.CleanUp();
}
obj.SetValue(IsEnabledProperty, value);
}