Mapping ToolTipText?

I just recently started playing with UserControls but there is a strange Problem. How can i map 'ToolTipText' property of usercontrol to one of its constituting controls? This property is added by default by Extender Object but its not available in Set Mapping dialog of ActiveX Ctrl Interface wizard (AxCIW) ! but still u can select it from Select Interface Members Dialog of AxCIW, Now it will show up in Set Mapping n you can map it to one of the sub-controls but it remains with usercontrols n only shows up in background n not over sub-controls! whts happening here? I added a new property n mapped it to ToolTipText of some sub-control n it worked but this one doesn't! Help pls!:confused: