Why can't I use the object that the uicontrol creates within a class created GUI?

I need to use the variable created in the callback function, but anytime I try, I get an error saying that I'm pretty much trying to convert an instance of my class to a number. Is it an issue with the get function or of the uicontrol within a class?

classdef LaserFilterTest < handle

    properties
        fig;
        title_405;
        menu_405;
    end

    properties(Access = private)
        callback_405;
    end

    methods
        function obj = LaserFilterTest()

            obj.fig = figure;
            obj.callback_405 = @setpos3;
            obj.title_405 = uicontrol(obj.fig, 'Style', 'text', ...
                'String','405 Laser','Position', [20 350 100 20]);
            obj.menu_405 = uicontrol(obj.fig,'Style','popup', ...
                'String', '100%|50%|25%|10%|5%|1%', ...
                'Position', [20 300 100 50], ...
                'Callback',{@(src,event)setpos3(obj,src,event)});

        end
    end

    methods(Access = private)
        function setpos3(obj,src,event)
            val = get(obj,'Value');
            disp(val,'this value is')
        end
    end
end

Answer 1

[per isakson]

There are different types of objects (, which is a bit confusing)

• handle graphic objects
• instances of user classes

The line, which causes the error should read

    val = get(obj.menu_405,'Value');

I trust that you fix the problem with disp