1.Set Static property to true. AssemblyInfo should contain a class from your assembly.
<sitefinity:ResourceLinks ID="ResourceLinks1" runat="server" UseEmbeddedThemes="true">
<sitefinity:ResourceFile Name="Telerik.Sitefinity.Samples.Resources.Layout.css" Static
="true" AssemblyInfo="Telerik.Sitefinity.Samples.Reference, Telerik.Sitefinity.Samples" />
2. Layout.css should be "EmbeddedResource" and it has to be registered inside AssemblyInfo.cs
If 1 and 2 are met the class is add to a page.
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