Disable save dialog in Simulink

Hello! I'm wondering if it's possible to programmatically disable the Save dialog which popups when you close a Simulink model? I.e when you press the X or similar. I've tried using bdclose and close_system in CloseFcn callback and even in PreSaveFcn callback but neither seems to work as the dialog still appears.

Best Regards MC

[Jyotish Robin]

Using the below 2 commands:

>> save_system(modelName)
>> close_system(modelName)

in the 'close_fcn' callback can hopefully help you.