Comments cannot contain two adjacent hyphens '--'
[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]
A XAML comment block cannot contain the character sequence "--". For more information, see XML Comments [XML Standards].
Error ID: XAML0106
This error message also applies to the Silverlight Designer.
To correct this error
Remove any instances of the character sequence "--" from the comment block.