.Net Configuration: How to use tag values instead of attributes

I'm writing a custom configuration section. I'd like the xml to look something like this:

<MainSettings>
    <UpperCase>True</UpperCase>
    <PopupClient>False</PopupClient>
    <Language>en-GB</Language>
</MainSettings>

How do I code the ConfigurationSection and ConfigurationElement derived classes to produce this?

I know how to produce it in this form:

<MainSettings>
    <UpperCase value="True" />
    <PopupClient value="False" />
    <Language value="en-GB" />    
<MainSettings>

However, this would produce somewhat unpleasant to use model code in the form:

mainSettings.UpperCase.Value = true;

instead of simply:

mainSettings.UpperCase = true;

I'm also aware of the xml form:

<MainSettings UpperCase="True"
              PopupClient="False"
              Language="en-GB" /> 

which can be married up to the second code form.

So, is it possible to match up the first or second xml forms with the second code form?