Hi Kevin thanks four your tip,
i've tried setting EnableVirtualScrolling="true", but behaviour is the same, load data but showed position is first again each time next items are loaded.
Perhaps the problem is loading data, this is the code to load data:
Protected Sub ddl_combo_ItemsRequested(ByVal sender As Object, ByVal e As Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs) Handles ddl_combo.ItemsRequested
Dim mensaje As String = String.Empty
Cargar_ddlActivosOnDemand(e.NumberOfItems, 10, conexion, mensaje, ddl_combo, e.Text)
e.Message = mensaje
End Sub
Function Cargar_ddlActivosOnDemand(ByVal ItemOffset As Integer, _
ByVal ItemsPerRequest As Integer, _
ByVal Cnx As OleDbConnection, _
ByRef Mensaje As String, _
ByVal ctrl_dropdown As Telerik.Web.UI.RadComboBox, _
Optional ByVal TextoFiltro As String = "") As Boolean
Dim strsql As String
Dim data As System.Data.DataTable
strsql = "SELECT * FROM TABLA WHERE (DESCFIELD LIKE '%" & TextoFiltro.Trim.Replace("'", "''") & "%')"
data = Ejecutar_Consulta_DataSet(Cnx, strsql).Tables(0)'Return Table
Dim endOffset As Integer = Math.Min(ItemOffset + ItemsPerRequest, data.Rows.Count)
For i As Integer = ItemOffset To endOffset - 1
Dim ItemCombo As New Telerik.Web.UI.RadComboBoxItem()
With ItemCombo
.Value = data.Rows(i)("CODFIELD").ToString()
.Text = data.Rows(i)("DESCFIELD").ToString() & "(" & data.Rows(i)("CODFIELD").ToString() & ")"
ctrl_dropdown.Items.Add(ItemCombo)
End With
Next i
Mensaje = endOffset & " - " & data.Rows.Count
Return True
End Function
Thanks to everybody
JPrian