Hello everybody, I've try to post my problem in Gwt-Mosaic Group,but I haven't got any reply. So I came here to find if anyone can help me at this problem. in my project ,I need a dropdown tree,so a extends ComboBoxBase and Override it's abstract method, everything is perfactly matched my requirement,except one thing...the dropdownPanel(actually it is a PopupPanel) is transparent. I've tried many methods ...but I'm failure... any one here can't give me a little help ? any idea will be greatly greatly ..(greatly)^100 .. appricated! thanks!
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