Generally, the styles used in our themes are theme specific. Thus, you should predefine the template of RadTileList / RadTile against each theme. You can manually extract the template for the RadTileList that is available with the installation files of the RadControls. You can find it together with all the other templates used for RadTileList inside "Telerik.Windows.Controls.xaml" file browsing to "InstallationFolder\Silverlight\Themes\OfficeBlack(or Windows7/ Windows8 )\Themes" folder.
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