WPF MVVM – How to add a workspace to a collection of tabbed workspaces only once

I’m new to WPF and I’m trying to build a tabbed-workspace interface that opens all my application views into the main window as user controls on tabs. I’ve used these articles to learn and build my tabbed interface: http://codingtales.blogspot.com/2010/02/creating-complete-tabbed-interface-in.html https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/february/patterns-wpf-apps-with-the-model-view-viewmodel-design-pattern It is working good so far. But in most instances I want to add a…

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