struct App : TopWindow {
	typedef App CLASSNAME;
	EditString s;
	Label l;
	App(){
		Add(s.HSizePosZ(5,5).TopPosZ(5,25));
		Add(l.HSizePosZ(5,5).TopPosZ(35,25));
		s.WhenAction << THISBACK(DoSomething);
	}
	void DoSomething(){
		l.SetLabel("Length: "+IntStr(AsString(~s).GetCharCount()));
	}
};