Docking a pane under child frame?

I would like a docking pane to be docked under a child frame, I can do this within the app using the Docking Icons, but how do I do it programmatically.

All I can see is that I can CreatePane with a neighbour which is another pane, and define left/right/top/bottom. But I dont want it at the bottom of the whole app window, I have other panes there, I want this pane within the child area.

Hope I have described the problem enough, but this might help, the bit outlined in red is the location where i want the pane to be created:

Thanks again oleg.