Specify MATLAB file executed when start event occurs
StartFcn property specifies the MATLAB® file function to execute when
a start event occurs. A start event occurs immediately after you issue
StartFcn callback executes synchronously.
The toolbox does not set the object's
'on' until the callback function finishes executing.
If the callback function encounters an error, the object never starts
Start event information is stored in the
String, function handle, or cell array
The default value is an empty matrix (