textbox.setVisibleLength(8);
textbox.setValue("#000000");
textbox.addStyleName(ComplexColorPicker.style.margins());
PushButton custom = new PushButton("Custom...");
custom.addStyleName(ComplexColorPicker.style.buttonsMargins());
custom.setStylePrimaryName(ComplexColorPicker.style.customColorPushbutton());
custom.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
// ComplexColorPicker is a DeckPanel, so we show our widget