Drag Child node to make it a Parent Node

Hello All
I have implemented Drag -Drop functionality in my tree. Which
consists of root and child nodes. I hide the Root node of the tree now
is there any way to make a child node as a parent node because when I
drag the child node in backward( <--) direction at the level of parent
node no drop method calls in this case then how can I make this child
node a parent node ????? I will be very thankful to your for your kind
suggestion
Regards
Sunny Khan

Ah
I think it is actually an Apple App switcher thing.
So if the finder window does noy cover the After Effects Project window, it works, but if you have to use the app switcher, sometimes it works and sometimes it doesn't.
I don't think it is a file type issue, so much as a live application issue, or maybe GPU related.
It's a weird thing, not that important, but it does limit where you can and can't drag from.
Tris

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