Key navigation between member groups and classes done.
numberOfSelectedRow renamed to selectedRowIndex
Check not type of framework element, but its' DataContext.
Clearer comment.
searchCategory renamed into searchCategoryFrameworkEle
Added regions and more comments.
Check what key was pressed before all other.
Get rid of FindUpVisualTree.
Regions added.
More comments added.
Empty string.
Merge branch 'Sitrus2' into DUI-KeyNavigation(fromMemberGroup-to-ClassList)
e.Handled = false moved before if-clause.
buttonsWrapPanel is used instead of sender.
Remove excess true assignment.
OnSubClassesPanelKeyDown moved in LibraryWrapPanel, and was renamed into OnLibraryWrapPanelKeyDown
FindFirstChildListItem added.
In FindFirstChildListItem removed generic class.
Remove excess namespace.
Merge pull request #127 from vmoyseenko/DUI-KeyNavigation(fromMemberGroup-to-ClassList)

DUI: key navigation. Part 2