Blend error

The following is part of one of the samples. Compiling it in VS is fine, no errors, and it runs fine too. But opening the xaml in blend causes the following error;

the property 'route' can only be applied to types that are derived from 'link'
pointing to '<go:Route'

<Polygon Fill="Black" Points="8 4 0 8 2 4 0 0" go:LinkPanel.Index="-1"
go:LinkPanel.Alignment="1 0.5" go:LinkPanel.Orientation="Along" />

I reported that bug on Expression Blend 3. Microsoft confirmed the bug and fixed it for Expression Blend 4.

BUT: it seems Microsoft has removed access to this bug report!

I am using silverlight 4 beta still, so I guess it was fixed in the final release.