 			{
 				// If this is the only popUp, we should expose accessibility 
 				// of the top-level system manager's document
-				sm.document.accessibilityProperties.silent = false;
+				if (sm.document.accessibilityProperties)
+					sm.document.accessibilityProperties.silent = false;
 				
 				// We should also expose accessibility 
 				// of the sandbox root's document.
-				var sbRoot:Object = popupData.systemManager.getSandboxRoot();				
-				sbRoot.document.accessibilityProperties.silent = false;
+				var sbRoot:Object = popupData.systemManager.getSandboxRoot();	
+				if (sbRoot.document.accessibilityProperties)
+					sbRoot.document.accessibilityProperties.silent = false;
 			}
 		}
 		else if (index > 0)

			// of the underlying popUp
			underneathPopUpData = popupInfo[index - 1];
			
			underneathPopUpData.owner.accessibilityProperties.silent = false;
			
			// All the nested popUp's AccessibilityProperties 
			// changes should be handled by a single 

					sbRoot.document.accessibilityProperties.silent = false;
				}
				
				try {
					Accessibility.updateProperties();
				}
				catch(e:Error) {
					// Flash Player issue on windows causes hasAccessibility and active to be true when accessibility is turned off 
				}
			}
			return true;
		}
