Checkpointing a window that doesn't have focus

I'm writing tests for a mapping program.  The map is displayed in one window, and there is a dialog that the user can call up, to change various properities of the map.  This dialog is "always on top," and always has focus when it is open.



As the user makes changes to the map properties in this dialog, the changes are immediately reflected on the map, in the other window.  Even before the Apply/OK buttons are clicked.



I would like to verify this with TestComplete.  Test to make sure that changes are immediately reflected in the map window, before the OK/Apply/Cancel buttons are clicked.  Is this possible?  Region checkpoints done on a window that doesn't have focus don't seem to work.  Thanks!