Create a new RibbonPanel on the specified tab. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
| C# | 
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| Visual Basic | 
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| Visual C++ | 
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Parameters
- tabName
 -  Type:  System String  
The name of the tab, on which the new panel will be created. 
- panelName
 -  Type:  System String  
The name of the panel to be created. 
Remarks
 This method will create a custom panel appending to the specified tab. This method is not supported in Macros. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | tabName or panelName is a null reference ( Nothing in Visual Basic) . | 
| Autodesk.Revit.Exceptions ArgumentException | tabName or panelName is Empty. | 
| Autodesk.Revit.Exceptions InvalidOperationException | Too many panels have been added to this tab (Maximum is 100). |