External controls - inheriting from base web.config

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I am referencing external controls defined in web.config
system.web/pages/controls... illustrated as follows...

<pages validateRequest="false"
enableViewStateMac="true"
enableEventValidation="false">
<controls>
<add tagPrefix="slcms" namespace="SLCMS.CustomControls.GridView"
assembly="SLCMS"/>
<add tagPrefix="slcms" namespace="SLCMS.CustomControls.WaitScreen"
assembly="SLCMS"/>
</controls>
</pages>
I have a root asp.net web application in which the web.config is populated
with most of the web.config settings for several second level asp.net web
applications, including the pages definition above. I suppose one would call
this....inheriting web.config definitions.....so I have very little in the
2nd level web.configs...

In VS.NET 2005 SP1 I am getting the following message if the pages
definition is only in the root web.config....and not in the 2nd level
web.config....

Unrecognized tag prefix or device filter 'slcms'.

Is there a means I can get rid of these annoying VS.NET 2005 messages ???

--
Philip