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I am extending the PropertySupport.ReadWrite<T> class using Color for the <T> in the Netbeans Platform PropertySheet TopComponent. It brings up the JColorChooser control and works fine for RGB color components but since the color editors in Java now have built in support for transparency in the JColorChooser control, I think this class should be updated to support it also. Currently it only passes back the RGB component the user selected and won't fire messages for transparency changes at all.