private void _setHeader(int row) {
flexPanel.getRowFormatter().setStyleName(row, "MappingsTable-header");
if ( !readOnly ) {
SelectAllNonePanel selAllNonePanel = new SelectAllNonePanel("Delete") {
@Override
protected void updateAllNone(boolean selected) {
for ( MappingAssoc ma : mappingAssocs ) {
ma.cb.setChecked(selected);
}