Problem with VirtTreeGrid sample

[Administrator]

I''m trying to extend this sample so that I can programmatically set the column headers after loading the data. I''ve tried:

Me.gridControl1(0, 3).Text = "12345"
Me.gridControl1(1, 3).Text = "54321"

but only cell(1,3) gets updated. Any ideas why the column headers aren''t being updated.

Thanks
Akash

[Administrator]

Another problem: I can''t resize the column widths at runtime. Is there some grid property that must be set to allow this?

[Administrator]

I put your code in a button handler and it worked OK for me on the click of the button. Both values were set.

You should set to see if you have somehow set a ReadOnly style property on the header cell. That would prevent your code from working.

The ResizeColsBehavior property is how control whether your user can resize the colwidths. Make sure you do not have this set to none.

[Administrator]

I am sorry. I do see the problem in the VirtTree sample with the header not being set. I will update this when I have more informastion.

[Administrator]

To set the headers, you can add code to QueryCellInfo an dset them there.

Private Sub GridQueryCellInfo(ByVal sender As Object, ByVal e As GridQueryCellInfoEventArgs)

            If e.RowIndex = 0 And e.ColIndex > 0 Then
                e.Style.Text = String.Format("col{0}", e.ColIndex)
            ElseIf ((e.RowIndex > 0) _
                        AndAlso (e.ColIndex > 0)) Then
                e.Style.CellValue = externalData((e.RowIndex - 1)).Items((e.ColIndex - 1))
                If (e.ColIndex = 1) Then
                    e.Style.CellType = "TreeCell"
                    e.Style.Tag = externalData((e.RowIndex - 1)).IndentLevel
                    e.Style.ImageIndex = CType(externalData((e.RowIndex - 1)).ExpandState, Integer)
                End If
                e.Handled = True
            End If

        End Sub

The reason you cannot size the columns is that the columns widths are being set in the QueryColWidth event. You would have to remove that event to allow for teh default sizing to take place, or you would have to change the handler to size things in the event.

[Administrator]

Thanks Clay,

Both your fixes work as expected.

Akash