Adds a Ribbon item to the panel. 
Namespace: Autodesk.Revit.UI
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 24.0.0.0 (24.0.0.0)
Since: 2011
Syntax
| C# | 
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| Visual Basic | 
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| Visual C++ | 
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Parameters
- itemData
- Type: Autodesk.Revit.UIRibbonItemData
 Data containing information about the new item.
Return Value
The added Ribbon item.Remarks
 The new item may either be a PushButton, PulldownButton, SplitButon, RadioButtonGroup, ComboBox, or TextBox depending upon the type of data passed in. The new item may be created as a large-size vertical control in the panel.
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.ExceptionsArgumentNullException | Thrown when itemData is a null reference (Nothing in Visual Basic). | 
| Autodesk.Revit.ExceptionsArgumentException | Thrown when an item with the itemData.Name already exists in the panel or the data is not of the correct type. |