One possible reason for the described behavior is referencing the Telerik NoXaml assemblies by mistake. Note that these assemblies do not contain the styles and the templates of the controls, so that they should be merged separately. You could check here
for more details on this.
Remove all the Telerik references from the project and reference them again from the Binaries
folder ( not Binaries.NoXaml
Let us know whether this helps.
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