So create a basic RibbonWindow project with a DockSite and ToolWindowContainer / ToolWindow inside them and then drop in some basic whatever content inside then launch the app and either connect Snoop to it or use the VS2017 Live Visual Tree tool to take a look at the top-level elements under App: you will see that CanVirtualize and IsVirtualizing are both set to true in the properties for those window visuals. I'm not setting those, and even when I explicitly set them to false all the way down to my own content inside a ToolWindow they still get set.
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