I have a variable simThroughput in the callback function of "dropdown" and want to use that variable in the callback function of "button".How can I do that?

I am trying to use app.simThroughput in the "button" callback but get an error saying :

No appropriate method, property, or field 'simThroughput' for class 'app1_testing_channel_models'.

Note:app1_testing_channel_models is how I have saved my app.

[Stephen23]

https://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html