Не удается автоматически сгенерировать допустимое значение по умолчанию для свойства "<var>Property Name</var>". Укажите значение по умолчанию явно, когда тип владельца "<var>Type Name</var>" регистрирует DependencyProperty.

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Cannot automatically generate a valid default value for property '<var>Property Name</var>'. Specify a default value explicitly when owner type '<var>Type Name</var>' is registering this DependencyProperty.

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