Owner-Drawn Transparent SelectBox

Building on my previous transparent bullet labels submission, I have built this control which draws transparent checkboxes. It is still a work in progress but ready for feedback. One drawback, it uses the dreaded GetKeyState + Timer combination to capture mouse clicks within the control rectangle. If anyone knows a better way to trap mouse events on the transparent parts of a control, I'd be happy to hear it...Anyway, it is functional...just launch the .vbg file...