using Autodesk.Revit.DB; using Autodesk.Revit.UI; namespace Szmedi.Toolkit.RvAssists { public class EnableOnPlanOrSection : IExternalCommandAvailability { public bool IsCommandAvailable(UIApplication applicationData, CategorySet selectedCategories) { var view = applicationData?.ActiveUIDocument?.ActiveView; return view is ViewPlan or ViewSection; } } }