case 10123: Adding int-property constraint
case 10173: Improve Diagram Editor, move datatypes to the right, group them by module
Mark DataObjectViewModel as readonly when the datacontext is also readonly
DiagramEditor: Improving handling of changed objects
DiagramEditor: Adding icons to toolbar
DiagramViewModel: Add a "create class" Dialog
DiagramEditor: Use correct method for selecting new items
DiagramEditor: Onyl expand current module