@Override
    public void setIcon(final SvgImage icon) {
        // No icon
    }
Creates an empty dialog box specifying its "auto-hide" property. It
should not be shown until its child widget has been added using
{@link #add(Widget)}.

@param autoHide <code>true</code> if the dialog should be automatically hidden
                when the user clicks outside of it
@param modal    <code>true</code> if keyboard and mouse events for widgets not
                contained by the dialog should be ignored
stroom-core-client-widget/src/main/java/stroom/widget/popup/client/view/SimplePopup.java