So you want to use the new style of dialog where you pick an option from a tree on the left and the appropriate form shows up on the right. This article shows you were to start and how to accomplish this!
Latest View Management Articles - Page 2
Adding a Document Selector to a MDI Application
Adding a Customozied 'More Windows...' Dialog to an MDI Application
MDI Windows Manager dialog
Implementing Full-Screen Mode
Creating an (MDI) app that ALWAYS displays two views of the same document
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