В "<var>X</var>" можно размещать только элементы RibbonMenuItem, RibbonSplitMenuItem, RibbonGallery или RibbonSeparator. "<var>Y</var>" не является допустимым контейнером.

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Unlocalized message

'<var>X</var>' can only host a RibbonMenuItem, RibbonSplitMenuItem, RibbonGallery or RibbonSeparator. '<var>Y</var>' is an invalid container.

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