m_selectorState.setValue(I_LayoutBundle.INSTANCE.generalCss().cornerBottom());
m_opener.addStyleName(CSS.selectBoxSelected());
addHoverHandlers(m_opener);
m_openClose = new PushButton(
I_ImageBundle.INSTANCE.style().triangleRight(),
I_ImageBundle.INSTANCE.style().triangleDown());
m_openClose.setButtonStyle(ButtonStyle.TRANSPARENT, null);
m_openClose.addStyleName(CSS.selectIcon());
m_panel.add(m_openClose);