I have an SDI app that has two panes, each with its own framewnd and view. One of the panes is a tree view. The problem I'm having is that I can't seem to programmatically select the other pane when I double-click on a tree item. That is, I want to have the same effect as if the user clicks on the other pane. I have tried calling the other pane's SetFocus and/or SetActiveWindow, but neither works.

Any help or advice would be greatly appreciated.