thank you for your help. it is working as intented on IE.
if I take the code you showed earlier
<ext:TabPanel ID="TabPanel1" runat="server" ActiveTabIndex="0" Height="300" Width="800">
<Tabs>
<ext:Tab runat="server" Title="Tab 1" Html="Switch to Tab2" />
<ext:Tab
runat="server"
Title="Tab 2"
AutoLoad="http://ext.net/license/commercial/Coolite-Commercial-License-Agreement.pdf"
/>
</Tabs>
</ext:TabPanel>
on IE, If I switch to the other tab and then return to Tab1, the pdf is still display.
On FF3, Tab1 displays the PDF then select Tab2, go back to Tab1 no PDF displayed.
Am I missing something.
this is the center panel I am using just in case
<Center>
<ext:TabPanel ID="CenterPanel" runat="server" ActiveTab="0" ActiveTabIndex="0" >
<Tabs>
<ext:Tab ID="CenterTab1" runat="server" Title="Tab 2" AutoLoad="http://ext.net/license/commercial/Coolite-Commercial-License-Agreement.pdf" />
<ext:Tab ID="Tab1" runat="server" Title="Center" Border="false" BodyStyle="padding:6px;">
<Content>
<ext:FitLayout runat="server">
<ext:Panel ID="Panel3" runat="server" Height="450px" Title="Google" Width="600px"
Html="<iframe id='Panel3_IFrame' width='100%' height='100%' src='reports/mole.pdf' frameborder='0'></iframe>" />
</ext:FitLayout>
</Content>
</ext:Tab>
<ext:Tab ID="Tab4" runat="server" Title="Event Tab" Html="I am tab 3's content. I also have an event listener attached."
BodyStyle="padding: 6px;" AutoScroll="true">
<Listeners>
<Activate Handler="handleActivate" />
</Listeners>
</ext:Tab>
</Tabs>
</ext:TabPanel>
</Center>
</PRE>