So I would need to change ECCount=2 to now say ECCount=3 , and the rest gets updated to 3
ECClassName3 = Revit.SDK.Samples.DistanceToPanels.CS.SetDistanceParam
ECAssembly3 = C:\Revit SDK 2010\DistanceToPanels.dll
ECDescription3 = Compute the distance from a selected object to all panels and store in a panel
Make a curtain panel by pattern with a length instance parameter "Distance", load it into a divided surface in a mass FAMILY (not an rvt). Select another family in the massing environment and push the magic button in the Add-Ins menu.