Problem using Ext.net tabpanel in IFrame mode on IE 7 and IE8

[hemant]

I am using the following code
using the following code

<ext:Panel ID="pnlForms" runat="server" Closable="false" Title="Forms" Layout="Fit"
Icon="ApplicationForm" Visible="false" Disabled="true" Height="910px" >

<AutoLoad Url="Forms.aspx" Mode="IFrame" MaskMsg="Loading" NoCache="true"
ShowMask="true" PassParentSize="true? />

<Listeners>

<Activate Fn="refreshForms" />

</Listeners>

</ext:Panel>

But on IE8 and IE7,If I click any where on tabcontainer(<ul> tag),it scroll down a little bit.
Screenshot before and after are also attached.
They work fine on FF and IE9.
Seems it?s the width of tab ?UL?(container of tabs) or some other css issue with <ul> tag which is causing it to
scroll down on click.