Maximum columns in a ListBox

[Rasm]

Admin
Below is my code to fill the ListBox - Guess my approach to reading values into the ListBox is very crude - however if I set 'LastRow=10' then it all works - in terms of being able to fill the ListBox

PcMax - ok - so the max is 30 columns - I was using ListView - but it is unstable - I had to change a bunch of ListView objecxts to ListBoxes - major pain.

With Worksheets("testing").UsedRange
        LastRow = .Rows(.Rows.Count).Row
        ColLast = .Columns(.Columns.Count).Column
        'LastRow = 10
    End With
    With ListBox1
        .ColumnCount = LastRow
        .ListStyle = 1
        .MultiSelect = 1
        .Clear
        For ii = 1 To ColLast
            .AddItem Worksheets("testing").Cells(1, ii).Value
            For i = 2 To LastRow
                .List(ii - 1, i - 1) = Worksheets("testing").Cells(i, ii).Value
            Next i
        Next ii
    End With