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CTreeCtrl::Expand() sends TVN_ITEMEXPANDING once

CTreeCtrl::Expand() sends TVN_ITEMEXPANDING once

CTreeCtrl::Expand() sends TVN_ITEMEXPANDING once

I've noticed that the CTreeCtrl only sends a TVN_ITEMEXPANDING notification to it's parent on the first call.  Any subsequent calls to this function on the same node do not send the notification.

I'm lazily populating the tree, so I need this notification in order to load the children of the item being expanded.  Do I need to and the message handler in a derived CTreeCtrl class in order to forward this notification to it's parent?  It seems as though that's a bit tedious, or do I need to somehow reset a flag when the node is collapsed to make it think it's it first time being expanded?

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