firefox浏览器（49.0.2）下滚动鼠标DataGrid滚动条移动幅度小，几乎不滚动

Layout Collapse Not Alignment

$(".easyui-panel").form("clear")  cant't clear ComboBox(Multiple Select)
the text is clear but the item still selected

I close the dialog  and then open，the dialog can not drag in ie8 when "modal: true",
$(function () {
        $("#div").dialog({
            width: 200,
            height: 200,
            modal: true,
            content: 'test',
            title: "title"
        });
        $("#btn").click(function () {
            $("#div").dialog("open")
        });
    });