Gets or sets the alternate text for the image used to indicate that a dynamic menu item has a submenu.
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When a dynamic menu item contains a submenu, an image can be displayed to indicate that the user can expand the menu. Use the Menu.DynamicPopOutImageTextFormatString property to specify the alternate text for this image. The text that you specify provides assistive technology devices with a description of the image that can be used to make the control more accessible.
There are two ways to display the image:
Set the Menu.DynamicEnableDefaultPopOutImage property to true to use the built-in image (default).
Set the Menu.DynamicPopOutImageUrl property to specify a custom image.
This property applies to both the built-in image and the custom image.