winform自定义滚动条

[{"title":"（ 107 个子文件 261KB ） winform自定义滚动条","children":[{"title":"Demo.exe <span style='color:#111;'> 20.00KB </span>","children":null,"spread":false},{"title":"Solution1.suo <span style='color:#111;'> 16.50KB </span>","children":null,"spread":false},{"title":"ThumbLeft.png <span style='color:#111;'> 149B </span>","children":null,"spread":false},{"title":"ThumbMiddle.png <span style='color:#111;'> 519B </span>","children":null,"spread":false},{"title":"rightarrow.png <span style='color:#111;'> 546B </span>","children":null,"spread":false},{"title":"......","children":null,"spread":false},{"title":"<span style='color:steelblue;'>文件过多，未全部展示</span>","children":null,"spread":false}],"spread":true}]