Restore coe.

src/VisualStudio/Core/Next/FindReferences/Contexts/AbstractTableDataSourceFindUsagesContext.cs

@@ -85,14 +85,13 @@ private abstract class AbstractTableDataSourceFindUsagesContext :
                 _findReferencesWindow = findReferencesWindow;
                 TableControl = (IWpfTableControl2)findReferencesWindow.TableControl;
 
-                // Determine the current grouping state 
-                DetermineCurrentGroupingByDefinitionState();
-
                 TableControl.GroupingsChanged += OnTableControlGroupingsChanged;
 
                 // If the window is closed, cancel any work we're doing.
                 _findReferencesWindow.Closed += OnFindReferencesWindowClosed;
 
+                DetermineCurrentGroupingByDefinitionState();
+
                 // Remove any existing sources in the window.  
                 foreach (var source in findReferencesWindow.Manager.Sources.ToArray())
                 {