How to avoid/change shortcuts for buttons in dialog

[Davte]

When I add a button (or even fixed text), manually or at runtime, in a dialog, a letter gets underlined and becomes shortcut for that key (see picture).

Often it's useful, but I would like to manage this process and be able to set it off.
I x-rayed the whole object but couldn't find a property or method with a suggestive name, so I'm asking if anyone knows the name of the property/method and eventually how it works and how to interfere.
Thank you in advance,
Davide

[JohnSUN-Pensioner]

Just use tilda (~) to define one character of the label as a mnemonic

[Davte]

Thank you a lot! This was useful for changing the underlined letter. What if I want to prevent any letter to be underlined (i.e. no shortcut for this button)?