Selection Callback for text input
<p>I'm using MATLAB GUIDE to build a GUI to control a piece of hardware. I have a data table the user needs to fill, and every time they select a cell a new configuration is sent to the hardware. This is easily done using the <code>CellSelectionCallback()</code>.</p>

<p>However, I also have a single reference value that is currently being entered into an <code>edit</code> textbox. I would like for the GUI to send a new configuration to the hardware whenever a user selects the textbox, but before they enter their new value. Is there a similar <code>SelectionCallback</code> function that can be used for the textbox? The best solution I've come up with is to create a 1x1 table instead of an edit box.</p>