make list explicitly element ids

Author: Jeremy Tammik

Labs/2_Revit_UI_API/SourceCS/2_Selection.cs

@@ -413,9 +413,7 @@ public void CancelSelection()
     //  TaskDialog.Show("Revit UI Lab", s);
     //}
 
-    /// Changing this in Revit 2015  
-    /// 
-    public void ShowElementList(IEnumerable elemIds, string header)
+    public void ShowElementList(IEnumerable<ElementId> elemIds, string header)
     {
       string s = "\n\n - Class - Category - Name (or Family: Type Name) - Id - " + "\r\n";
 
@@ -432,8 +430,6 @@ public void ShowElementList(IEnumerable elemIds, string header)
       TaskDialog.Show("Revit UI Lab", s);
     }
 
-    /// end of Changing in Revit 2015
-
     /// <summary>
     /// Helper function: summarize an element information as a line of text, 
     /// which is composed of: class, category, name and id.