Using simulink runtime data in callback functions

Hello, I am stressedup with App Designer. I have stateflow model in Simulink to be controlled from an app built in app designer. I am able to creat a Listener and a run time object in an updateGui helper function.

    
    properties (Access = public)
        status3; % Description
    end
    
    methods (Access = public)
        
        function updateGUI(app, varargin)
            
            % Create an object that gets the run-time value of the specified block
            rto_2 = get_param('ChargingProcess/Display3','RuntimeObject');
            rto1 = get_param('ChargingProcess/CarBatteryOut1','RuntimeObject');
            
            % Update the GUI accordingly. 
            app.status3 = rto_2.InputPort(1).Data.char;
%             app.EditField.Value = rto_2.InputPort(1).Data.char;

           % Assign input from Car Battery Level(CarBatteryOut1) to Car Battery level 1 editfield 
            app.CarBatteryLevel1EditField.Value = rto1.InputPort(1).Data;

        end
    end

there are other objects which are not very necessary now

This works well and displays the information on the app as I want. Now, i need some of this information (status3) in a push button callback to control a a switch. First issue is that I cannot access the varriable status3 directly in a callback function. I treid to declear it as a property and call it in the button callback funtion. It is called but does not update as the simulation progresses.

The main idea is for the switch controlled by the button callback function to stay on '1' when the button is pressed to the point when status3 matches a particular string 'WaitAtStation' and a certain edith field vallue == 100. In this case, I used a while loop. I treid to output the edith field value (gotten from simulink too ) with the same callback funtion but it also does not update as the value in the edith field changes

                 striingValue = num2str(app.status3)
                 function Charge1ButtonPushed(app, event)
                     set_param('ChargingProcess/ChargeMyCar1','sw','1');
                     while (app.CarBatteryLevel1EditField.Value == 100 && strcmp(stringValue, ~'WaitAtStation'))
                         set_param('ChargingProcess/ChargeMyCar1','sw','0');    
                     end              
                 end 

This either doesnt work or freezes my system when the button is pushed. What i actually need help is;

1) How to get status3 and the app.CarBatteryLevel1EditField.Value in my callback function that will update as the actuall vallues change in simulink

2) A better way represent the logic because the while loop appears not to be doing the job