Expand on server side in master page

[Web Services]

I need to expand a rad panel bar that is in a master page based on what page is loaded. I have this in my page load method but I get a null reference error. I'm guessing it's because the panelbar is in the master page. How do I access my panelbar in child page and expand one of the items of my choice. Here is the code I am trying
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Dim panel As RadPanelBar = Master.FindControl("RadPanelBar1")
        Dim item As RadPanelItem = panel.Items.FindItemByText("Entities")
        item.Expanded = True

    End Sub

[Paul]

Hi Web Services,

Please refer to our PanelBar / Programmatic State Persistence example for details on how to achieve your goal.

Best wishes,
Paul
the Telerik team

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[Web Services]

That's what I needed thanks.