Compare Attribute (ambiguios)

I work on the tutorial MusicStore of Jon Galloway and I found a problem with the Attribute Compare, because this attribute is ambiguios and in the original code only apper "Compare".

MSDN say:  "The recommended alternative is to use the System.ComponentModel.DataAnnotations.CompareAttribute type, which has the same functionality as this type."

In the first figure you can see the problem, in the second figure the soluction.

Figure 1.

Figure 2.