Colin,
Awesome work. It appears we've solved a couple issues with this long topic and are able to achieve the following:
1) Provide mouse-over selection of listbox accurately
2) Get the XY Cords of a given control by calculating the dimensions of the window.
Thank you for your help with this and all others who contributed.
I will be adding my "custom control" tutorial to this forum in some time.
I will close the thread in 24 hours
Best regards