addStyleName in java code

[JanaN]

I had to change the background color of a panel header on click of a button.

So, I declared by styles in *.ui.xml file and 

in the jave class, i'm calling panelHeaderUiField.addStyleName. But this is not reflecting.

If I use setStyleName, it's clearing the existing style but not applying the new style.

is there a way to do that? I'm using UIBinder.

Thanks

[JanaN]

I got it done using

panelHeaderUiField.getElement().getStyle().setBackgroundColor("...")

[Dhinakar Reddy Pothireddi]

Just copy the style to the main css file. It would work. The styles in the ui.xml file can be used only by the widgets on loading itself. Call the setStyleName from the java file.

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