Enhancement: MouseWheel support in TabSet

Hi Isomorphic,

I just opened many samples in the showcase and noticed that the TabSet does not support left/right scrolling with the mouse. I'm used to Firefox, which supports this. IMO it is a good feature, but it seems to be different in every browser-UI.

1. Firefox 26 native tab: Minimum Tab width, soft scrolling with mouse-wheel or with mouse-pointer via arrow click. Additional "Select Tab" dropdown.
2. IE 11 native tab: Minimum Tab width, hard scrolling one-by-one via arrow click with the mouse only.
3. Chrome 39: No minimum Tab width. Every tab clickable.

I like the FF way the best and SmartGWT is doing it exactly like this - only the mousewheel-scrolling, which I'm using a lot in Firefox, is missing.

I'm using that many SmartGWT Tabs in the showcase only, so this has no priority for me, but I thought you might wanted to know anyway.

Best regards,
Blama