The mentioned TemplateSelector is used in the code in order to change the ComboBox in the EditAppointmentDialog when the ResourceType has set AllowMultipleSelection. So if you just need to be able to select multiple resources you can set the AllowMultipleSelection of their ResourceType. If this is not what you need to achieve, I'll ask you to share some more details on the desired scenario so I can further help you.
I'm looking forward to hearing from you.
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