When the FileManager is placed in a Window/Dialog, the ContextMenu does not open.

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ADMIN EDIT

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Essentially, the ContextMenu is rendered but appears behind the Window/Dialog and thus it is not visible. The issue is z-index related and a possible workaround is to increase the z-index of the ContextMenu to ensure it will be visible.

Example: https://blazorrepl.telerik.com/ccuWuIuM51LP1T4559