GSS for a instance of Widget

Hi

I'd like to generate a style with GSS for an INSTANCE OF A WIDGET 

Any idea how to do that ?

StyleElement styleElement = com.google.gwt.dom.client.StyleInjector.injectStylesheet(cssResource.getText());

is giving always the same classnames. (so reinject this, change color of all widgets shown)

How to generate new classNames (example with id of widget as suffix) and apply this new classnames to the widget instance only ?

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