Browsable protected attribute doesn't show in designer

[DS]

I've got a user control called SearchInline that has a few protected
properties, for example:
protected string SpName { get .. set.. }
I then create another user control called SearchAgent for example, which
inherits from SearchInline. Through the code I can access and modify the
SpName property (this.SpName = "foo";), but it does not show up in the forms
designer's property list (VS2003).

Even if I explicitly set the component model attributes
[Description("yada"), Category("Required"), Browsable(true)] in SearchInline
for the protected methods, they refuse to show up in the Forms Designer of
either SearchInline, or SearchAgent. If I change the access modifier to
public instead of protected they show up without a problem, but I don't want
them to be public. How can I get this to work (i.e. show the protected
attributes in the inherited control)?

Thanks in advance,
-Dan