右击添加上下文菜单

public void mytree()
{
    DatabaseCore db = new DatabaseCore();
    List<allTreeView> myList = new List<allTreeView>();
    DataTable dt = db.FillDataGrid();
    foreach (DataRow row in dt.Rows)
    {
        string categories_id1 = row["ID"].ToString();
        string parent_id = row["parentId"].ToString();
        string categories_name = row["name"].ToString();
        myList.Add(new allTreeView(
                    int.Parse(categories_id1), 
                    categories_name, 
                    int.Parse(parent_id)));
    }
    Dictionary<int, TreeViewItem> flattenedTree = 
        new Dictionary<int, TreeViewItem>();
    foreach (allTreeView item in myList)
    {
        TreeViewItem treeNode = new TreeViewItem();
        treeNode.Header = item.Header;              //this is header
        treeNode.Tag = item;
        flattenedTree.Add(item.ID, treeNode);
        if (flattenedTree.ContainsKey(item.ParentID))
        {
            flattenedTree[item.ParentID].Items.Add(treeNode);
        }
        else
        {
            product_tree.Items.Add(treeNode);
        }
    }
}

这填充了我的树。我想显示上下文菜单右键点击复制，剪切，选择和添加一些更多的功能在我的树的每个节点。