说明：  调用CxImage的加载图片功能编写的图片缩略图功能的list类,其中可以通过路径单独加载缩略图,还可以单独删除指定路径的缩略图,并支持鼠标的单双击事件,可以取得当前选择的缩略图图片所在的路径.
(Add image function call CxImage image thumbnail function written list class, which can be loaded individually by the path thumbnail, you can also specify a separate path to delete the thumbnail and a single double-click the event to support the mouse, you can get the currently selected Thumbnail image where the paths.)