need help with Treeview recursive search not working properly

Hello experts,
I have a treeview with a layout similar to this:

Q036118
      Unit-001
      Unit-002
Q037710
      Unit-001
Q066914
      Unit-001
      Unit-002
      Unit-003
      Unit-004


The following code allows me to search the treeview and find any node matching my search string.....that works fine.

My problem is,  that after I find the Job Number (Q036118) I need to search directly under that node for a second search string (Unit Number).


private void FindByText()     // searches whole treeview
        {
            TreeNodeCollection nodes = m_vaultFolderTree.Nodes;
            foreach (TreeNode n in nodes)
            {
                FindRecursive(n);
            }
        }


        private void FindRecursive(TreeNode treeNode)
        {
            foreach (TreeNode tn in treeNode.Nodes)
            {
                // if the text properties match, color the item
                if (tn.Text == this.txtJobNum.Text)   // if node text matches search string
                    tn.BackColor = Color.Yellow;    // color item
               
                this.m_vaultFolderTree.SelectedNode = tn;  // select the node

                // here search for the unit number, then select that specific node
               

                FindRecursive(tn);
            }
        }


Can someone help me search under the node I have already found ?  thanks !!!  

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