Thank you for contacting us.
I guess that the problem came from the automatically added references. Could you please check the version of the controls populated in the toolbox? You can check if the version of the controls in the toolbox is the one you want to use by using the Toolbox Configurator
Additionally, you can check which distribution is used in each project by running the Configuration Wizard
Let me know if the toolbox and all your projects use your purchased version.
the Telerik team
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