Default GWT Checkbox to unchecked

I have the following simple class which extends Checkbox and want to make it so that the Checkboxes default to unchecked upon creation. I tried calling setValue(false) in this class however the checkboxes are still defaulting to checked. Any help is appreciated

 public final class ServerTaskCheckBox extends CheckBox {

    private final ServerTask serverTask;

    public ServerTaskCheckBox(ServerTask serverTask) {
        super(serverTask.getCheckBoxLabel());
        this.serverTask = serverTask;
        setValue(false);
    }

    public ServerTask getServerTask() {
        return serverTask;
    }

}