From Xojo Documentation

Property (As Boolean )
aListBox.HasHeader = newBooleanValue
BooleanValue = aListBox.HasHeader

New in 2019r2

Supported for all project types and targets.

If True, a row of column headers is added to the ListBox. The user can sort the column by clicking the heading if ColumnSortDirectionAt is true not set to None for that column.


The following example shows the Headers row. The code is in the Open event of the control.

Me.HasHeader = True