Referencing a property on the Site.Master?

I have added this line to my .aspx page:

MasterPageFile="~/Site.master"

Here is the start of the Site.Master.cs file:

    public partial class Site : System.Web.UI.MasterPage
    {
        public RDDBAdminDataStore RDDB { get; set; }

I get these squiggly lines in the Site.Master with the following error:
The name 'RDDB' does not exist in the current context.

When I compile, they go away, then shortly return.

Any idea what's wrong??

newbieweb