Create a new RibbonPanel on the Add-Ins tab. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 17.0.0.0 (17.0.1090.0) 
Syntax
| C# | 
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| Visual Basic | 
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| Visual C++ | 
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Parameters
- panelName
-  Type:  System String  
 The name of the panel to be created.
Remarks
 This method will create a custom panel appending to the Revit AddIns tab. This method is not supported in Macros. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | panelName is a null reference ( Nothing in Visual Basic) . | 
| Autodesk.Revit.Exceptions ArgumentException | panelName is Empty. | 
| Autodesk.Revit.Exceptions InvalidOperationException | If more than 100 panels were created. |