Shortcut key on button labels

Although it is not documented, I realized that if I use **&** before any letter on the label of a `UI\ Controls\Button`, the letter becomes shortcut key, as in & Close -> **C**lose

However, I did not figure out how to capture hotkey presses. Is this implemented?

Start at the UI\Controls\Button entry point and inspect how an ampersand in a label is interpreted. Then look for the existing keyboard or hotkey event entry points; done means determining whether shortcut presses can be captured and documenting or implementing the behavior clearly.

Written by the indexing model from the issue text.