Lamp on App Designer does not work when I run simulation on Simulink

I am making an application to send and receive data in real time from a simulink model. By realtime I mean setting "inf" to "Stop time" not using the realtime toolbox.

So, my code works or I intend it to work as follows:

-With switch_1 start the simulation

-With switch_2 I send a "1" to a constant block in simulink and turn on a lamp in app designer.

The problem is that the lamp doesn't work when smiulink and app designer are running at the same time. Only when I run the app without simulink.

I have no idea why this happens, any other element works without problem. I hope you can help me.

% Callbacks that handle component events
    methods (Access = private)

        % Code that executes after component creation
        function startupFcn(app)
            app.Switch_1.Value = 0;
            app.Switch_2.Value = 0;
            set(app.Lamp1,'Color',[1 0 0]);
            set(app.Lamp2,'Color',[1 0 0]);
            set_param('Sim','SimulationCommand','stop');
            
        end

         % Value changed function: Switch_1
        function Switch_1ValueChanged(app, event)
            value = app.Switch_1.Value;
            if value == 1
                set_param('Sim','SimulationCommand','start')
            elseif value == 0
                set_param('Sim','SimulationCommand','stop')
            end

        end

        % Value changed function: Switch_2
        function Switch_2ValueChanged(app, event)
             value = app.Switch_2.Value;
             set_param([bdroot,'/Masa'],'Value', num2str(value));
             if value == 1
                 set(app.Lamp1,'Color',[0 1 0]);
             elseif value ==0
                 set(app.Lamp1,'Color',[1 0 0]);
             end

        end



    end

Answer 1

[Kojiro Saito]

drawnow might solve this.

For example,

if value == 1
     set(app.Lamp1,'Color',[0 1 0]);
 elseif value ==0
     set(app.Lamp1,'Color',[1 0 0]);
end
drawnow

[Fer_pg]

Thank you so much, it works.