Pre render problem

[Andy Green]

Hi

I have a pre render event to scan the header and turn off the select all checkbox.

My pre render code looks like this:

Protected Sub rgProcedures_PreRender(sender As Object, e As EventArgs) Handles rgProcedures.PreRender

    For Each HeaderItem As Telerik.Web.UI.GridHeaderItem In rgProcedures.MasterTableView.GetItems(Telerik.Web.UI.GridItemType.Header)
        Dim chkSelectAll As CheckBox = DirectCast(HeaderItem("colClientSelect").Controls(0), CheckBox)
        chkSelectAll.Visible = False
    Next


End Sub

I have just added a <columnGroup> to combine a header over 2 columns and get the following error:

Specified argument was out of the range of valid values.
Parameter name: index

At this line in my Pre render: Dim chkSelectAll As CheckBox = DirectCast(HeaderItem("colClientSelect").Controls(0), CheckBox)

Any Ideas

[Andrey]

Hi,

You need to modify your code as follows:

Protected Sub rgProcedures_PreRender(sender As Object, e As EventArgs) Handles rgProcedures.PreRender
For Each HeaderItem As Telerik.Web.UI.GridHeaderItem In rgProcedures.MasterTableView.GetItems(Telerik.Web.UI.GridItemType.Header)
    For Each cell As TableCell In HeaderItem.Cells)
        If cell.Controls.Count > 0 Then
            Dim chkSelectAll As CheckBox = DirectCast(CellFindControl("CheckBoxID"), CheckBox)
            If chk IsNot Nothing Then
                chkSelectAll.Visible = False
            End If
        End If
    Next
    Dim chkSelectAll As CheckBox = DirectCast(HeaderItem("colClientSelect").Controls(0), CheckBox)
    chkSelectAll.Visible = False
Next
End Sub

Greetings,
Andrey
the Telerik team