diff --git a/src/share/classes/javax/swing/PopupFactory.java b/src/share/classes/javax/swing/PopupFactory.java
index 13a1f9d1a687d2925a96f31a00684367f94f3158..713ada71558c6ce56ff298fd2fbcec2218354815 100644
--- a/src/share/classes/javax/swing/PopupFactory.java
+++ b/src/share/classes/javax/swing/PopupFactory.java
@@ -203,6 +203,12 @@ public class PopupFactory {
                     popupType = HEAVY_WEIGHT_POPUP;
                     break;
                 }
+            } else if (c instanceof Window) {
+                Window w = (Window) c;
+                if (!w.isOpaque() || w.getOpacity() < 1 || w.getShape() != null) {
+                    popupType = HEAVY_WEIGHT_POPUP;
+                    break;
+                }
             }
             c = c.getParent();
         }