"<var>X</var>" не имеет конструктора без параметров. Для GridViewHeaderRowPresenter требуется конструктор, чтобы создать плавающий заголовок во время изменения порядка столбцов.

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'<var>X</var>' does not have a parameterless constructor. GridViewHeaderRowPresenter needs the constructor to create a floating header during column reorder operation.

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