Page Directive Attributes

Hi -

Anyone have experience with custom Page directive attributes? I created a public property in my base page class and simply adding it to the Page directive works if my aspx page uses the Inherits attribute. But it doesn't work with a code-behind. Any ideas?

/**** Base class ****/
class BasePage : System.Web.UI.Page
{
    private string _show;
    public string ShowHeader
    {
        get { return _show; }
        set { _show = value; }
    }
}

/*** ASPX page *****/
<%@ Page Language="C#" ShowHeader="True" %>


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Thanks,