title: UML Designer 7.1 on Activity Explorer does not display Diagrams Viewer
body: <p>I'm working with UML Designer and as I was following the tutorial from <a href="http://www.umldesigner.org/ref-doc/define-the-system.html#Create_A_Project" rel="nofollow noreferrer">http://www.umldesigner.org/ref-doc/define-the-system.html#Create_A_Project</a> the Diagrams Viewer from the Activity Explorer tab does not appear. (all the viewpoints are selected)</p>