I have that code in my app

Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() {

@Override
public void execute() {

try {

answerPanelHeight = display.getAnswerPanel().getOffsetHeight();

display.getNextButtonPanel().setHeight(answerPanelHeight);

display.getNextButtonPanel().redraw();

} catch (Exception e) {

}

}
});

What argument I must add in Widget.addAttachHandler() ? Because I use 
SmartGwt and i dont have method onLoad();

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