Added a presence check for dataCell
Merge pull request #177 from jugimaster/jukka-13399-flame

Added a presence check for cells when pasting data
Fix row and column resizing in TableView.
Merge pull request #178 from ctimmerm/table-view-resizing

Fix row and column resizing in TableView.
Move ViewSupport to mixins.
Use toggleProperty in DisclosureView.
Add conditional rendering for childViews.