Get all the custom Panels on a designated Revit tab. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- tabName
 -  Type:  System String  
The name of the tab on which the panels are located. 
Remarks
 Built-in panels will not be included. tabName must be the name of one of the tabs added by  CreateRibbonTab(String)  . This method is not supported in Macros.