combotree初始化加载折叠

$('#ddlCategory').combotree({
url: '/credit/GetCredit_CategoryList',
editable: false, //不可编辑状态
cache: false,
valueField: 'id',
textField: 'text',
onLoadSuccess: function () {
$("#ddlCategory").combotree('tree').tree("collapseAll");
}
});