Drop Down button multi function

Hi all,
i need to implement a usual button with a drop down button , like back button on Internet explorer and a drop down button.
i did it in the following way:
1) i create normal button
2) add it to my toolbar
3) create a popupmenu
4) add a few menuitem to the previous popupmenu
5) create a button for a drop down
6) create event "mouse prsessed" for a drop down button,
whenever i pressed this button a pop up menu show up.
it all works fine.
i have only one problem.
how can i group the two buttons to one.
i mean for example:
when i point on a back button on my Internet explorer both buttons are
highlighted.
Thanks

Don't cross post:
http://forum.java.sun.com/thread.jspa?threadID=5122040&messageID=9427488#9427488
http://forum.java.sun.com/thread.jspa?threadID=5122039&messageID=9427487#9427487
http://forum.java.sun.com/thread.jspa?threadID=5122038&tstart=0
%

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