add LogicalParent null test for getDataSource

diff --git a/src/GraphicObjects/GraphicObject.cs b/src/GraphicObjects/GraphicObject.cs
index be2bf0e77e680bdcfa72e7500fb133ca1f39cd03..d0219b15bad29c54210b9ee835748ae27c3bc05d 100644 (file)
--- a/src/GraphicObjects/GraphicObject.cs
+++ b/src/GraphicObjects/GraphicObject.cs
@@ -434,7 +434,7 @@ namespace Crow
                                        this.ResolveBindings();
                        }
                        get {                           
-                               return dataSource == null ? 
+                               return dataSource == null ? LogicalParent == null ? null :
                                        (LogicalParent as GraphicObject).DataSource : dataSource;
                        }
                }