fix spelling + refactoring
Merge pull request #5 from MaherJendoubi/master

fix spelling and some code re-formatting.
Revert "fix spelling"
Merge pull request #6 from Injac/revert-5-master

Revert "fix spelling"
Fixed RightAreaVisibilityChanged. Null reference exception was thrown at design time, if a new SplitButton instance was placed on the page.
Merge pull request #8 from Injac/development

Development
Added Changelog