Active x Control

i have created a active x control

what i want is that when active x control is displaying then background browser should be disabled

i.e., as we see in modelpop up util and unless we close model pop up we cannot work on back window

same way i want to do in active x control

i have created my cntrol in activex but its goes to background when i click in background browser

how can i prevent it and achieve the requirement.