changing "Active" view for view events/controls?

[John Dowson]

When using multiple (undocked) views, how do you select the view to which view events (e.g. AXIS_PAN_HEADING, AXIS_PAN_PITCH, etc) apply?
I can only seem to change the "active" view by clicking in the required view using the mouse. If the current "active" view is an undocked sub-window, and I switch the windows (keyboard) focus back to the the main FS window (programmatically), the view events/controls are still applied to the undocked sub-window rather than the main view/window which now has the focus - why is this?