Update underlying data field when related object is updated.

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

PROMS/VEPROMS.CSLA.Library/Generated/Annotation.cs

@@ -135,6 +135,7 @@ namespace VEPROMS.CSLA.Library
 				if (_MyItem != value)
 				{
 					_MyItem = value;
+					_ItemID = value.ItemID;// Update underlying data field
 					PropertyHasChanged();
 				}
 			}
@@ -167,6 +168,7 @@ namespace VEPROMS.CSLA.Library
 				if (_MyAnnotationType != value)
 				{
 					_MyAnnotationType = value;
+					_TypeID = value.TypeID;// Update underlying data field
 					PropertyHasChanged();
 				}
 			}