When you go in the store and you want to scroll the bottom bar, you have to put your mouse in the upper border of the bar. If you try to scroll the bar clicking in the middle or in the bottom of the bar it doesn't work.
Click [here](http://img809.imageshack.us/img809/5240/i5qt.png) for the screenshot.
The bar will work only if you click where I draw the red line.
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