Is it possible to add a second ListBox in the code of ASPxCallbackPanel example ( http://demos.devexpress.com/ASPxperienceDemos/CallbackPanel/Example.aspx ) ??

I am adding a new ListBox with a new DataSourceID:

<dxe:ASPxListBox runat="server" Height="221px" Width="147px" TextField="Name" DataSourceID="AccessDataSource3" ValueField="EmployeeID" ID="ASPxListBox1" 
ClientInstanceName="ListBox" BackColor="Transparent">

and then i add a new DataSource with a different SELECT QUERY:

 <asp:AccessDataSource ID="AccessDataSource3" runat="server" DataFile="~/App_Data/nwind.mdb" SelectCommand="SELECT [EmployeeID], [FirstName] + ' ' + [LastName] AS [Name]

FROM [Employees] 
WHERE ([EmployeeID] > 10)
ORDER BY 2" />  

but unfortunately it doesnt work.Can you help me please ?

To be more specific.

After inserting a new ASPxListBox  with ID="ASPxListBox2" and a new DataSource with ID="AccessDataSource3", i change the behind-code like that (using the ASPxListBox_ValueChanged() sub):

VB:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        DataBind()
        ASPxListBox1.SelectedIndex = ASPxListBox1.Items.IndexOfValue(AccessDataSource2.SelectParameters("PeopleID").DefaultValue)
    End Sub

    Protected Sub ASPxListBox2_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ASPxListBox2.ValueChanged
        AccessDataSource2.SelectParameters("PeopleID").DefaultValue = ASPxListBox2.SelectedItem.Value.ToString()
        DataBind()
    End Sub

    Protected Sub ASPxListBox1_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ASPxListBox1.ValueChanged
        AccessDataSource2.SelectParameters("PeopleID").DefaultValue = ASPxListBox1.SelectedItem.Value.ToString()
        DataBind()
    End Sub

but the ASPxRoundPanel still displays data from one of the two ListBoxes.

What's going wrong?

Thank you for your support DevExpressers

Hello

I don't quite understand what you want to achieve without taking a look at you entire project, but I can try to suppose.
Since the ASP.NET viewstate isn't persisted during callbacks, you need to set both datasource parameters in both listboxes' ValueChanged event handlers.
If it doesn't help you, please feel free to send you project to our Support Center.

Roman thank you very much for your interest,

check my project at the Support Center link : http://www.devexpress.com/Support/Center/p/Q139593.aspx

I havent find a solution yet...