ASP.NET

public class ExTreeView : TreeView
{
    protected override TreeNode CreateNode()
    {
        return new ChildTreeNode(this);
    }
}

public class ChildTreeNode : TreeNode
{
    public ChildTreeNode() { }

    public ChildTreeNode(string nodeType) { m_NodeType = nodeType; }

    public ChildTreeNode(ExTreeView owner) { this.m_Owner = owner; }

    private ExTreeView m_Owner;
    internal ExTreeView Owner { get { return m_Owner; } }

    private string m_NodeType;
    internal string NodeType
    {
        get { return m_NodeType; }
        set { m_NodeType = value; }
    }

    protected override object SaveViewState()
    {
        object baseState = base.SaveViewState();
        return new Pair(baseState, NodeType);
    }

    protected override void LoadViewState(object savedState)
    {
        Pair p = savedState as Pair;
        base.LoadViewState(p.First);
        NodeType = p.Second as string;

    //The node type is hard coded for the sake of simplicity.
        TreeNode newNode;
        if (NodeType == "Child1TreeNode") { newNode = new Child1TreeNode(); }
        else if (NodeType == "Child2TreeNode") { newNode = new Child2TreeNode(); }
        else { newNode = new TreeNode(); }

        newNode.Text = this.Text;
        newNode.Value = this.Value;

        ReplaceCurrentNode(this, newNode);
    }

    private void ReplaceCurrentNode(ChildTreeNode currentNode, TreeNode newNode)
    {
        TreeNodeCollection nodes;
        if (currentNode.Parent == null)
            nodes = currentNode.Owner.Nodes;
        else
            nodes = currentNode.ChildNodes;

        int index = nodes.IndexOf(currentNode);
        nodes.Remove(currentNode);
        nodes.AddAt(index, newNode);
    }
}

public class Child1TreeNode : ChildTreeNode
{
    public Child1TreeNode() : base("Child1TreeNode") { }
}

public class Child2TreeNode : ChildTreeNode
{
    public Child2TreeNode() : base("Child2TreeNode") { }
}

    Public Function SetFocus(ByVal FocusControl As Control) As String<br />
        'Setting focus to supplied control<br />
        Dim Script As New System.Text.StringBuilder<br />
        Dim ClientID As String = FocusControl.ClientID<br />
<br />
        'Building java script<br />
        With Script<br />
            .Append("<script language='javascript'>")<br />
            .Append("document.getElementById('")<br />
            .Append(ClientID)<br />
            .Append("').focus();")<br />
            .Append("</script>")<br />
        End With<br />
<br />
        Return Script.ToString()<br />
    End Function

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand

End Sub

Dim myOrginalArgs As New System.Web.UI.WebControls.CommandEventArgs(myCommandName, myArgument)
Dim myGridViewCommandEventArgs As New System.Web.UI.WebControls.GridViewCommandEventArgs(myGridViewRow, myOrginalArgs)
GridView1_RowCommand(myObject, myGridViewCommandEventArgs)