I've tried this approach, but when the form poppes up, thw hosting form is loosing focus. i.e. the caption color of the form changes to gray. In the combobox it stays blue even when it dropped down. What can the reason for this? Thanks for answering.

I'm building some Control that displays a form that let's me do some operations. (like the combobox, datetimepicker, etc.) Now, I nees that the poped area will be on top of all windows like the regular ComboBox dropped region, and wouldn't be trimmed by the parent control rectangle. What is the currect technique for this? (Sorry about my terrible English, I'm not an american.)