[DevExpress]treeList1背景色設置與自定義圖標

為了和系統界面一致改成透明色：

            treeList1.BackColor = Color.Transparent;
            treeList1.Appearance.Empty.BackColor = Color.Transparent;
            treeList1.Appearance.Row.BackColor = Color.Transparent;
        

自定義圖標

  private void treeList1_CustomDrawNodeImages(object sender, CustomDrawNodeImagesEventArgs e)
        {
            //0 葉子 1  文件夾   2 打開文件夾
            if (e.Node.Nodes.Count > 0)
            {
                if (e.Node.Expanded)
                {
                    e.SelectImageIndex = 2;
                    return;           
                }
                e.SelectImageIndex = 1;
            }
            else 
            {
                e.SelectImageIndex =0;
            }
        }