TabCtrl Design issues

I've created a user control that inherits the behaviour of TabCtrl, name TabCtrlEx. The issue is this : Is there an easy way whereby I can just drag n drop controls onto TabCtrlEx? At the moment I'm having to 'guess' the locations of each control I add, and then run to review my design on the TabCtrlEx control.

when I insert TabCtrlEx onto a Form, I'm able then to drag and drop controls onto the TabCtrlEx, but the Form seems to handle the behaviour of the controls within TabCtrlEx.

I want my TabCtrlEx to handle the behaviour of the controls and not the Form, Is there a way to do this?

Regards

John