The Tiles for WPF and Silverlight controls do not support direct XAML content in their Header properties. You should either bind the Header to some CLR value, or leave it empty and include your desired Header content (such as an image) into the Content template.
For example:
| XAML |
Copy Code
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<c1:C1SlideTile Width="280" Height="200" Header="{Binding Name}" /> |
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