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Please, check this article
which deals with ItemTemplate
. You could create an ItemTemplate with anything you would like your combobox item to display, including plain wrapped text, and adjust the appearance further if needed with the SelectionBoxTemplate, which can force the display of only part of the item template.
Please, note that you may also need to modify the width of the drop down pop-up window to render properly your items if they are too long. You could easily change the width of the drop down using ItemsPanel
I hope this information will provide helpful guidance for you.
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