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The AddControls method allows you to add new controls to the ribbon at runtime. This is the only way to add new controls. Do not call Init multiple times.
To use this method, pass a string containing XML. It does not matter where the XML was originally stored. All that matters is that the one parameter you pass contains XML with one <AddControls> element. Each XML element is documented on the wiki, but you'll want to start with the <AddControls> element and work your way down.
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