how do you handler them. i tried attaching something like (event)onClickFunc didn't work. the same code work for entities.. i am puzzled.

Here is the code I use:
PANEL* pPANEL;
void pnlFirstButtonClicked()
{...}
pan_setevent(pPANEL,_VAR(3),_VAR(1),(EVENT)pnlFirstButtonClicked);