A question about com.javafx.preview.control.PopupMenu

My JavaFx application is running as applet. When the popup menu shows, a small warning icon displays besides the popup menu. If the popup menu hides, the icon hides too.
Everything works well if it does not run as applet. How can I remove the icon from applet?
Thanks!

Try to sign the applet (Project Properties-> Application -> Self Signed Jar checkbox)

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