Steps to reproduce: Create a class with one attribute. Create a property but with just one accessor. Open Create Property dialog again. the "Create Property" button is disabled and cannot be enabled by choosing accessor or anything. A warning "No attributes exists" is also displayed. Expected behaviour: - Select the possible accessor to create. - Disable the already created accessor button (Set/get) - Do not warn - Enable Create Property button It would be even better if the scope was settable for both accessors individually to begin with.