Tab control selchange

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VC6

C++

hi all,please help me.i've an urgent need.i've one dialog based application, wherein i've one tab control and i want to add OnSelChange() event for that.i cannot add this event to my dialog because of some error.i don't know what it is.My doubt is,how should be the declaration of this event in message map,means the format of declaration.please help me....
thank you in advance.