Компоненты нельзя добавлять в режиме локализации. Чтобы вернуться в форму по умолчанию и добавить компоненты, выберите значение "По умолчанию" в свойстве "Язык".

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Components cannot be added in localization mode. Select (Default) in the Language property to return to the default form and add components.

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