User-Form Problem: User can select headers in User Form (I want Header/no way to select)

Greetings everybody

So I have the following code as part of a userform I modified slightly from a Book (Excel 2010: Power Programming with VBA). I cant seem to see the attached image but what I get is the headers with a selection box next to it, what I want is for the first row to not be selectable. I need the headers but I don't want the user to be able to select them. I already programmed around this, since the macro ignores this selection but it looks unfinished with this issue. Will appreciate any and all support.

I know this could probably be explained better but I can't find an easy way to explain

Private Sub UserForm_Initialize()
    Dim ColCnt As Integer
    Dim rng As Range
    Dim cw As String
    Dim c As Integer
    
    ColCnt = ActiveSheet.UsedRange.Columns.Count
    Set rng = ActiveSheet.UsedRange
    With ListBox1
        .ColumnCount = ColCnt
        .RowSource = rng.Address
        cw = ""
        For c = 1 To .ColumnCount
            cw = cw & rng.Columns(c).Width & ";"
        Next c
        .ColumnWidths = cw
        .ListIndex = 0
    End With
End Sub