May you verify that you have used the same version of RadControls/WPF?
We had some issues related to the Project Configuration Wizard and we decided to remove it.
Since the WPF themes are not in separate assemblies you do not need this tab in WPF. The themes are incorporated in Telerik.Windows.Controls for WPF and adding a reference to a particular theme is not neccesary. I suggest that your colleague uses a different version where the Theme tab still exists for WPF.
Will you check this one and let me know whether the issue still persists?
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>