I am dynamically adding a combo box inside a ControlContainerTool in the ribbon and binding it. The combo displays properly and I am able to change the value, but no validation events fire for it. I am trying to handle the ToolValueChanged event, but this only seems to work when I put a simple control like a checkbox into the ribbon. If I add a control inside a ControlContainerTool object, that ToolValueChanged event does not fire. Is there a better event to handle for this?