Bonjour Guillaume Crétot Richert, :)
Thank you for your interest in our products.
When you inherit a RadControl, you should override the ThemeClassName
property in order to inherit the theming of the control as well. For more information please refer to the following Knowledge Base article: Inherit themes from RadControls
I hope this helps. If you need any further assistance, feel free to contact me.
the Telerik team
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