I am trying to put a formatted phone number in part of the drop-down's display value, and am having no luck.  In the ComboBox's PopulationDataSourceSettings dialog, I can set a display member format string.  What would I put in here to make "1234567890" display as "(123) 456-7890"?  I know you can use things like {0:c} to display currency or {0:d2} to display a given precision, and so on.  I'm just at a loss as to what I can use here to display a phone number.  Also, one other thing to consider is international numbers.  What if this number is formatted differently for different instances?