RadTabStrip resizing in IE9

[Keith]

I have a huge project that used RadTabStrips liberally. In many of the pages, but not all, the RadTabStrip unexpectedly resizes to 100% of the browser width. This behavior is not exhibited in IE7 or IE8.

After a cursory look at the CSS for the pages affected, I noticed that there is an entry in the WebResource.axd

.RadTabStrip .rtsLevel {
 width: 100%; overflow: hidden; padding-top: 1px; clear: both; position: relative;
}

If I disable the width setting in this file (dynamically through the IE developer tools) the RadTabStrip displays properly, fitting the width of the multipage.

I do not set the width of the tabstrip anywhere because the width of the multipage may vary based on the dynamically created content.

The code for the tabstrip is:

<telerik:RadTabStrip ID="RadTabStrip1" runat="server" MultiPageID="RadMultiPage1" SelectedIndex="0">
    <Tabs>
        <telerik:RadTab runat="server" Text="Manage Disciplines" Selected="True">
        </telerik:RadTab>
        <telerik:RadTab runat="server" Text="Discipline Mapping">
        </telerik:RadTab>
    </Tabs>
</telerik:RadTabStrip>

Please advise of a solution to this issue.