"wait" cursor when calling RPC

Hi, I'm in the middle of a project and would like to display the wait
cursor when until RPC onSuccess is called. I've tried directly setting
and removing the style name of my panel with .waitCursor { cursor:
wait;}. But it seems very glitchey(I'm using Chrome). Then I tried
DOM.setStyleAttribute(RootPanel.get().getElement(), "cursor","wait");
but this again maybe only works once! Any suggestions guys?

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