After repaint scroll bar used cashed index for class button.
Merge branch 'Sitrus2' into DUI-ClassButtonBug(not_highlighted)
Comment added.
Flag isMouseDown added.
Excess baskets removed.
MouseUp is used to select item.
Revert changes in LibraryWrapPanel.
Remove empty string.
BringIntoView scrolls to selected item.
Merge pull request #186 from vmoyseenko/DUI-ClassButtonBug(not_highlighted)

DUI: class button bug(not highlighted)
Merge branch 'Sitrus2' into DUI-KeyNavigation(use-IsSelected)