Hi ... we have found some strange behviour when hosting Windows Workflows inside the RadDocking component. I have attached an example solution which demonstrates the problem. Basically it seems that the Click is being captured somewhere and is not making it to the combo to open it. The Workflow designer in the soltuion is shown working outside the Docking component, and not working inside it. To test the problem, just run the solution and then try and click the 2 combos.