anchor.diff:  Now, lets add some UI. We want to use standard *morda* widgets, so, let's initialize them in the Application constructor
   [source,c++]
   ....
  -class Application : public mordavokne::App{
  +class application : public mordavokne::application{
   public:
  -	Application() :
  -			mordavokne::App(mordavokne::App::WindowParams(r4::vec2ui(800, 600)))
  +	application() :
  +			mordavokne::application(mordavokne::window_params(r4::vec2ui(800, 600)))
   	{
  +		// mordavokne::application has the 'gui' member variable which is an instance of morda::gui
   		this->gui.initStandardWidgets(*this->get_res_file());
   	}
   };
   ....
   
  -Let's describe our GUI using the GUI script. Create a file named _main.gui._ in the _res/_ directory of your project with following contents
  +Let's describe our GUI using the GUI script. Create a file named `main.gui` in the `res/` directory of your project with following contents
   ....
  -@pile{// frame layout places widgets in the center one on top of another
  +@pile{ // frame layout places widgets in the center one on top of another
   	@column{ // vertical area layout places widgets one below each other
   		@push_button{
   			id{hw_button} // we can find this button by ID from code
  
positive.code: 
  
  
  std::unique_ptr<mordavokne::App> mordavokne::create_application(int argc, const char** argv){
  	return utki::makeUnique<Application>();
  }
  ....
  Now we can run the app and press the button and see that it will do something :).
  
negative.code: 		// set the widgets hierarchy to the application
  		this->gui.set_root(c);
  
  		auto textLabel = c->try_get_widget_as<morda::text>("info_text");
  		ASSERT(textLabel)
  
  		auto button = c->try_get_widget_as<morda::push_button>("hw_button");
  
  		auto textLabelWeak = utki::make_weak(textLabel); // make a weak pointer to the TextLabel widget.
  
  		bool even = true;
  
  		// connect some action on button click
  		button->click_handler = [textLabelWeak, even](morda::push_button&) mutable {
  			if(auto tl = textLabelWeak.lock()){
  				even = !even;
  				if(even){
  					tl->set_text("even");
  				}else{
  					tl->set_text("odd");
  				}
  			}
  		};
  