How make your Wheel Scroll working

I have a Tartarus Pro. The wheel scroll will not work if you bind to common keys (a-Z 1-0 etc) The games will not response. (Actually, this problem occur on all programmable wheel scroll) Recently, I figure it out. you have to bind to MOUSE BUTTON For example, bind to "mouse button 4" then your game will response normally. (at the same time, your mouse button 4 map to common keys)