I want to put ButtonTool in the large round button in the upper-left corner of the Ribbon (actually this is the RootToolsCollection ). When I try to do it it throws exception the there is no UI Adapter to handle RootToolsCollection. How can I do this to work?
You wouldn't want to add to the root tools collection. You would instead register a site for the ToolAreaLeft of the Ribbon.ApplicationMenu. Then you can add tools to that.
Thanks. It works!