Use Stateflow^® to create state machines that define the behavior of MATLAB apps. Stateflow charts can monitor your interactions with an app and enable or disable app widgets accordingly. For charts in Simulink^® models, use the keyword this to establish a bidirectional connection between the app and the chart, as illustrated in Model a Power Window Controller. For standalone charts in MATLAB, use the app startup callback to create a chart object that can communicate with the app, as illustrated in Design Human-Machine Interface Logic by Using Stateflow Charts.