API - PropertyManagerPage Macro Question

[brengine]

I am writing a macro using the PropertyManagerPage, and graphically selecting objects with the mouse works fine. What I'd like to do is populate a Selection Box with a specific feature by issuing a .Select from a portion of my code.

Currently...
If I have the PropertyManagerPage open I can click any of the features in the tree, and the Selection Box populates correctly. If I Close the PropertyManagerPage and then branch to my code, everything gets programmatically selected correctly. But if I leave the PropertyManagerPage Open and branch to my code during one of the Events, nothing gets programmatically selected (I even verified this with a boolean on the .Select command, True's with the PropertyManagerPage closed, False's with the PropertyManagerPage open).

Can anyone help?
Thanks,
Ken