Activity diagrams can have fork/join widgets, but it is impossible to change the fill color of them. Reproducible: Always Steps to Reproduce: 1. open umbrello 2. add an activity diagram 3. add a for/join widget 4. select and double click the fork/join widget 5. change color 6. press okay Actual Results: The selected colour is not applied to the widget Expected Results: The selected colour should be applied to the widget.