From Xojo Documentation
| This item was deprecated in version 2019r2, however it continues to work.
Please use TextField.Hint as a replacement.
Property (As String )
Use to display a cue or suggested value in the field. The CueText appears in the TextField in grey text.
On Windows and Linux, the Cue Text only appears when the TextField does not have focus.
This example is in the Open event of the control:
Me.CueText = "Enter something"