final ToggleButton btnDeleteTgl =
new ToggleButton(imageBundle.delete().createImage(), imageBundle.undo().createImage());
btnDeleteTgl.addStyleName(Styles.DELETE_BUTTON);
btnDeleteTgl.setTitle("Delete " + labelText);
btnDeleteTgl.getElement().setPropertyBoolean(UI_ADD, isUiAdd);
btnDeleteTgl.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
if(Element.as(event.getNativeEvent().getEventTarget()).getPropertyBoolean(UI_ADD)) {
remove(tabPanel.getTabBar().getSelectedTab(), true);
}