AjaxControl Tool kit TabContainer visibility issues

I am developing the website in .NET 3.5, VS 2008. I have a AjaxControlToolkit TabContainer control within Tabpanels I have many usercontrols and inside usercontrol I have my thrid paty Spell开发者_运维知识库 Check Utility, while rendering(Page load) the page many times my panel are not visible but when I refresh the page tabs are visible. Does any body faced any such issue ever?

check is there any thing you are doing in postback check?? secondly do check view state and initial vaule of your control, weatehr it is Visible or not