Encrypting web.config - <EncryptedData> Invalid Child Element

I followed Microsoft's "How To" to encrypt the connection strings section of my application (http://msdn.microsoft.com/en-us/library/ms998280.aspx)

Everything works fine and the section was encrypted.  I can run the application and it decrypts my connection string correctly.

When I look at my web.config the "configProtectionProvider" attribute is underlined in blue with a tooltip message of "configProtectionProvider is not declared".  Also, <EncryptedData> is underlined in blue with the tooltip message of "the element <connectionStrings> has an invalid child element 'EncryptedData'".  The encrypted section in my web.config looks like this:

  <connectionStrings configProtectionProvider="DataProtectionConfigurationProvider">
    <EncryptedData>
      <CipherData>
        <CipherValue>...</CipherValue>
      </CipherData>
    </EncryptedData>
  </connectionStrings>

How come these two items are underlined yet still work?