Label.AcceleratorKey
From Xojo Documentation
Event
The accelerator key for the Label was pressed.
Notes
You can define an accelerator character for a Label. In the Text property, precede the accelerator character with an ampersand. For example, the entry "&Home" signifies that the H is the accelerator. Now, pressing Alt+H on Windows triggers the AcceleratorKey event where you will typically set focus on the related TextField (or other related control).
Example
Set focus on the TextField when the accelerator key for the Label was pressed:
FirstNameField.SetFocus