WinLAF:Check mark is not clear in JCheckBox while compare with native check box by eclipse theme.

Bug Info:
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I compared the java check box with native check box in windows xp machine with third party theme (eclipse). I found the following difference in java check box.

The check mark is not clear and it is showing some white dots in the mark.

JDK Info:
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java version "1.6.0-swing_int_jcg_win_03"
Java(TM) SE Runtime Environment (build 1.6.0-swing_int_jcg_win_03-java2d_03_may_2006_12_03-b00)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b82, mixed mode)

Please check the attached images.