Does the UML Message Properties dialog pop up first? If so, you're in good shape.
The second UML Operation Properties dialog doesn't pop up automatically if the object that receives the message call has any existing operations. To get the Operation Properties dialog to appear, you need to click the "New" button.
Regards,
Kevin McNeish
C# MVP
www.oakleafsd.com
Kevin McNeish
Microsoft C# MVP
President, Oak Leaf Enterprises