GTK:Accelerator background shows incorrectly for checkbox and radiobutton menuitems at 'on' state.

Bug Info:
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Accelerator background shows incorrectly for JCheckBoxMenuItem and RadioButtonMenuItem at checked(on) state.

Select the either JCheckBoxMenuItem/JRadioButtonMenuItem which has accelerator and roll out the selection bar then the accelerator should have foreground color is black.

Expected Behavior:
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Accelerator should have a black foreground color while comparing with native component.

Actual Behavior:
================
Aceleraror has white foreground color.

JDK Info:
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java version "1.6.0-rc"
Java(TM) SE Runtime Environment (build 1.6.0-rc-b104)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b104, mixed mode)

GTK Version & Theme Details:
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VERSION: 2.4.0
Theme : Blue Print

The issue is reproducible with jdk6.0 latest b104 and also with jdk7 nightly build.

Please find the attached images for identifying the difference.
Please find the attached PopupMenuDemo application for reproducing the issue.