I have this code in the Opening event for Listbox1 and the same in the Shown event for Listbox2:
Me.ColumnCount = 3
Me.HeaderAt(0) = "Uno"
Me.HeaderAt(1) = "Dos"
Me.HeaderAt(2) = "Tres"
Me.ColumnWidths = "100,100,100"
For i As Integer = 0 To 6
Me.AddRow("This is the first column", "second", "third column")
Next i
This is how it looks when I debug:
The header is empty for Listbox2 and it is a little ‘taller’ than Listbox1 (both are 400 x 360)