VS2008 SP1 tabbled style MDI problem

Question

how can i change the prompt information of the close button in MDI child window when the mouse move on the close button.

eg: change from "Close" to "Close this winidow"

PS:I use the tabbed style MDI. if I use the normal sytle,I can use the "OnNcHitTest()" and "OnNcLButtonDown" to handle this problem.but use the VS2008 tabbed style MDI,it's not usefull.