Index: lams_tool_spreadsheet/web/includes/javascript/rsrcspreadsheetitem.js
===================================================================
diff -u -r29fac4bd0bdf28bcaaeee7aae4020ccb15b6e520 -r2b350be06485bbfe1da8c66def9fc2cd81e883a8
--- lams_tool_spreadsheet/web/includes/javascript/rsrcspreadsheetitem.js	(.../rsrcspreadsheetitem.js)	(revision 29fac4bd0bdf28bcaaeee7aae4020ccb15b6e520)
+++ lams_tool_spreadsheet/web/includes/javascript/rsrcspreadsheetitem.js	(.../rsrcspreadsheetitem.js)	(revision 2b350be06485bbfe1da8c66def9fc2cd81e883a8)
@@ -110,8 +110,13 @@
 		// then refresh "basic tab" spreadsheetlist and close this window.
 	}
 	function cancelSpreadsheetItem(){
-		var win = window.hideMessage ? window : window.top;
-		if (win.hideMessage != null){
-			win.hideMessage();
+		var win = null;
+		if (window.hideMessage) { 
+			win = window;
+		} else if (window.parent && window.parent.hideMessage) {
+			win = window.parent;
+		} else {
+			win = window.top;
 		}
+		win.hideMessage();
 	}
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