Type members layout - property region

Hello,

How can I add the name of a property to the region?

I tried:

    <Entry>
      <Match>
          <Kind Is="property"/>
      </Match>
      <Sort>
         <Name/>
      </Sort>
      <Group>
        <Name Region="$(Name)"/>
      </Group>
    </Entry>

and I got:

        #region $(Name)

        public String Lastname
        {
            get;
            set;
        }

        #endregion

Is there another keyword instead of '$(Name)'? Is there any documentation available for this tool?

Best regards,
Stefan