Xml Exception during update.

Hi: I am getting a Xml Exception error when I try to update an X:Key value. As you can see from the attached error it will not let me use a ':' character in my string which should be "x:Key". I am trying to change the x:Key= "HorizontalPipeOff" to x:Key= "some user defined name" but it gives me the error attached.

Mike Gallinger C.Tech. Cutting Edge Computing Software Developer