/*
     * [Function]
     * highlight tree node
     * [Input]
     * some TreeNode
     * 
     * [Output]
     * set color to highlighted color
     * 
     * [Note]
     */
    public Color highlightNode(TreeView trvValue, TreeNode someNode)
    {
        Color oldColor = trvValue.BackColor; //"{Name=Window, ARGB=(255, 255, 255, 255)}"
        if (someNode != null)
        {
            oldColor = someNode.BackColor; //"{Name=0, ARGB=(0, 0, 0, 0)}"

            // HTML #3399FF -> RGB(51,153,255)
            //"{Name=MenuHighlight, ARGB=(255, 51, 153, 255)}"
            someNode.BackColor = SystemColors.MenuHighlight;
            
            //node.BackColor = nodeHlBackColor;

            //node.ForeColor = Color.FromArgb(255, 255, 255);
            someNode.ForeColor = Color.White;
        }

        return oldColor;
    }
    

            if (e.ClickedItem == tsmiAddToSelection)
            {
                if (!curSelTreeNodeList.Contains(curSelTreeNode))
                {
                    // add to selection
                    curSelTreeNodeList.Add(curSelTreeNode);

                    //hightlight node
                    crl.highlightNode(trvCategoryTree, curSelTreeNode);
                }
            }