Mouse wheel scroll issue

Question

I have faced a big annoying trouble developing a new customized panel. hopefully you will show me a way out of this.
The panel recalculates it's content each time it gets an scroll.
I did this by handling the Scroll event of the panel but the problem is when the scroll comes from moue wheel, it does not fire the Scroll event.
There is also a MouseWheel event but it is not useful because it does not provide those "NewValue" and "OldValue" values which the Scroll event provides.