The content for the current sub-menu item displayed directly in the main menu as a preview.
If the HamburgerSubMenuNavigationButton.ShowInPreview option is enabled, the current item is displayed below the sub-menu button directly in the main menu. By default, the button's content in the preview is the same as the principal content displayed in the sub-menu fly-out panel. However, using the PreviewContent proprety you can provide a custom button's content to be displayed in the preview. To specify how the provided data object is rendered, use the HamburgerSubMenuNavigationButton.PreviewContentTemplate property. If no data template is assigned, the string representation of the object is used.
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