cursor:wait does not work when the mouse pointer is on a button

in css, I write
.waitCursor{
    cursor:wait;
}

then in code, I write
btnA.addClickHandleer(new ClickHandler(){

public void onClick(ClickEvent event){

RootPanel.get("uniqueID").addStyleName("waitCursor");
// ... lengthy process here;
RootPanel.get("unidquID").removeStyleName("waitCursor");

}

});


but the result is, if the user click the button and not move, the mouse pointer is change to "a hand shape", and will not change to wait cursor, only when the user click the button and move the mouse pointer to other places, the mouse pointer will change to wait cursor.
any method to solve?

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