The RibbonItem object represents an item on RibbonPanel, can be a push-button or a pull-down which should contain the information for creating one RibbonItem. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Remarks
 This class is not supported in Revit Macros. 
 Inheritance Hierarchy
  System Object  
Autodesk.Revit.UI RibbonItem
Autodesk.Revit.UI ComboBox
Autodesk.Revit.UI ComboBoxMember
Autodesk.Revit.UI RadioButtonGroup
Autodesk.Revit.UI RibbonButton
Autodesk.Revit.UI TextBox
 
 Autodesk.Revit.UI RibbonItem
Autodesk.Revit.UI ComboBox
Autodesk.Revit.UI ComboBoxMember
Autodesk.Revit.UI RadioButtonGroup
Autodesk.Revit.UI RibbonButton
Autodesk.Revit.UI TextBox