Start with a reference to a server control that resides in another project
in the same solution:
<foo:MyControl runat="server" id="bar" Property="value" />
If you change the accessibility of "Property" to be "private" (or protected,
etc.), then R# does not react by redlining the reference to the property.
In fact, mousing over "Property" still shows the proper tooltip, and Goto
Declartion still goes to the now-private declaration.