tree icon
You can specify default, expanded, and closed icons using treeOptions.defaultIcon, expandedIcon, and collapsedIcon.
treeView.treeOptions.iconImagesRoot = "/images/treeImage/";
treeView.treeOptions.iconImages = [
"grd_tree_open.png", "grd_tree_close.png", "grd_treeicon_leaf.png"
]
treeView.treeOptions.expandedIcon = 0;
treeView.treeOptions.collapsedIcon = 1;
treeView.treeOptions.defaultIcon = 2;