Added ScrollViewer control in MainWindow
Added ScrollViewer control in MainWindow

So that a scrollbar appears when a control is docked and resized below
the minimum width

jpadillak/Concordia_Capstone2013-14,jpadillak/Concordia_Capstone2013-14,jpadillak/Concordia_Capstone2013-14,jpadillak/Concordia_Capstone2013-14