void showOrHide(Element element, boolean show) {
        if (element == null) {
            return;
        }
        if (show) {
            element.getStyle().clearDisplay();
        } else {
            element.getStyle().setDisplay(Display.NONE);
        }
    }
Show or hide an element.

@param element the element
@param show true to show, false to hide
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractHasData.java