ComboBox.AllowAutoComplete

From Xojo Documentation

Property (As Boolean )
aComboBox.AllowAutoComplete = newBooleanValue
or
BooleanValue = aComboBox.AllowAutoComplete

New in 2019r2

Supported for all project types and targets.

If True, enables the autocomplete feature to complete text entries. The default is False.

Sample Code

Me.AllowAutoComplete = True