Hi.
I just have found a bug in Windows 8 Release Preview when using .Net 4.0/4.5.
I have a simple ComboBox with items in it. No custom templates for items/combobox and no styling. I can select Item only when mouse is above text in Item. If mouse is above empty space item is not selecting.
Problem is described also here by someone else: http://stackoverflow.com/questions/11118498/wpf-combobox-selection-in-windows-8-with-mouse-cursor
Everything is alright when using .net 3.5/3.0/2.0.