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.
Triangle is highlighted.
Dark highlighting added.
Highlighting for non-root elements added.
Bold when category is selected done.
Semibold doesn't disappear, when mouse is over.
Add margin.
Merge branch 'Sitrus2' into DUI-KeyNavigation(fromMemberGroup-to-ClassList)
e.Handled = false moved before if-clause.
buttonsWrapPanel is used instead of sender.