[C#]
    internal class NodeWithReadOnly : Node
    {
      private bool readOnly = false;
      public bool ReadOnly
      {
        get
        {
          return readOnly;
        }
        set
        {
          readOnly = value;
        }
      }
    }

[C#]
private void FillGrid(FlyGrid flyGrid)
{
  //add nodes and mark odd nodes as ReadOnly
  for(int i=0; i < 10; i++)
  {
   NodeWithReadOnly newNode = new NodeWithReadOnly("Node" + i.ToString());
    newNode.ReadOnly = i % 2 > 0;odd nodes is readonly
    flyGrid.Rows.Items.Add(newNode);
  }
  //connect to IsReadOnly event
  flyGrid.IsReadOnly += new NodeBoolHandler(flyGrid_IsReadOnly);
}

private bool flyGrid_IsReadOnly(object sender, NodeBase node)
{
  NodeWithReadOnly nro = node as NodeWithReadOnly;
  return nro != null ? nro.ReadOnly : false;
}