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Autodesk Confidential Information
Developer Days Online 
The Rice – API and UI Update
Reflects new Ribbon UI
§External Commands under External Panel in Ribbon dropdown button
§External Applications on the Add-Ins tab
§New classes for Ribbon UI API:
§RibbonPanel
§RibbonItem
§PushButton
§PulldownButton
§RibbonMenuItem
§* stacked buttons in beta2
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AIRMax initiatives. While internally we share the same code base for Ribbon UI integration, actually exposure of API are pretty much depend on the individual product team. API or customization capabilities for Ribbon is not the same as AutoCAD one.  At this stage, we are intentionally trying to make API to hook external application as simple as possible.