Force button release

Hello,

On mobile devices, when you press an UI button his state changes to pressed. If you move your finger outside de button while keep pressing, the state stills pressed even your fingir is no longer over the button.
I want to force the button to be released (at least visually) when you finger moves outside the button.

I have already this event (finger leave) checked manually, but I am not finding any function or property of the UI Button class that allows this behaviour.

Any help? tks!