Only allow drop as child on root node

[King Du]

I have a tree view control in which I only ever want to have one root node and it can contain as many children as it wants. When it comes to drag and drop how can I allow the user to drop a rule on the root node but only allow it to be dropped as a child of the root rule? Thanks!

[Svett]

Hi Patrick,

You can use the DragOverNode event of the RadTreeView control to prevent dropping a node at the wrong position. You can use the following code snippet:

private void radTreeView1_DragOverNode(object sender, RadTreeViewDragCancelEventArgs e)
{
    if (e.DropPosition != DropPosition.AsChildNode)
    {
        e.Cancel = true;
    }
}

I hope this helps.

Regards,
Svett
the Telerik team