diff --git a/PROMS/Volian.Controls.Library/StepRTB.cs b/PROMS/Volian.Controls.Library/StepRTB.cs
index 5728cf6e..cea369ea 100644
--- a/PROMS/Volian.Controls.Library/StepRTB.cs
+++ b/PROMS/Volian.Controls.Library/StepRTB.cs
@@ -3538,7 +3538,23 @@ namespace Volian.Controls.Library
 
 			// C2015-028 Add Editorial Mode to PROMS Step Editor
 			//   if in Editorial Mode, treat it the same as if the EditorialSpellCheck flag is set in the Format file
-			bool editorialmode = (this.Parent.Parent.Parent as StepTabPanel).MyDisplayTabControl.IsInEditorialMode;
+			bool editorialmode;
+			try
+			{
+                StepTabPanel pnl = null;
+                Control tempcntrl = Parent;
+                while (tempcntrl != null && pnl == null)
+                {
+                    tempcntrl = tempcntrl.Parent;
+                    pnl = tempcntrl as StepTabPanel;
+                }
+
+                editorialmode = pnl.MyDisplayTabControl.IsInEditorialMode;
+            }
+			catch 
+			{
+				editorialmode = false;
+            }
 
             if (MyItemInfo.ActiveFormat.PlantFormat.FormatData.EditData.EditoralSpellCheck || editorialmode)
 					DidEditorialSpellCheck = MySpellCheckDlg.DidCorrectSpelling;  // B2015-024 spell checker in editoral mode