更新面板刷新后如何执行javascript（无法获取Sys.WebForms.PageRequestManager.getInstance（）。add_endRequest（）;工作）

using some date time picker plugins i am unable to rebind them after ajax update panel completion. i used a control containing jquery plugins for date and time , inside page. it works fine at first but when change drop down list, it's update panel rebind and don't bind jquery functionality again.using some date time picker plugins i am unable