If the selected Library Document is out-of-range throw a specific error
Don't fail if the user clicks on open space in the BookMark list
Added property to provide a right margin (RTBMargin) between the RichTextBox and the StepItem
Added code to update the Procedure Panel when a Word Section is added.
Created a method to find a ProcedureDisplayTabItem for a specific item
Added code to Reset the Tab when a Section's Number is changed.
Added code to Reset a Procedures Parts when a Panel is Reset
Added an event for a Node being added.