[Gtk-sharp-list] Cancel Drag & Drop nefore it really starts

[TheSHEEEP]

Hey there,

I am planning to have two TreeViews, and both should have items that can be
dragged & dropped into each other.
However, there are also "category" nodes that include the actual data nodes.

I do not want a whole "category" node to be dragged around, only its child
items.
Now my question: How would I prevent the dragging of such a node?

What I tried was the following:

//-------------------------------------------------------------
//-------------------------------------------------------------
treeView.DragBegin += HandleMyDragBegin;
.....

[GLib.ConnectBefore]
void HandleMyDragBegin (object o, DragBeginArgs args)
{
	TreeIter iter;
	if (treeView.Selection.GetSelected(out iter)) 
	{
		...find out if selected node is a category, works...
		if (isCategory)
		{
			*args.RetVal = false;*
		}
	}
}
//-------------------------------------------------------------
//-------------------------------------------------------------

But that did not achieve anything.
Is there even a way to stop the dragging or is the best I can do to not
accept the "category" node when dropped?

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