I am pretty new to creating a custom field tupe and I have recently come across a need to create a custom SPLookUPField that allows multiple values. The main requirement is to change the way the control renders its data in Display mode. The Edit mode I would like to keep as is OOTB.
The linked data display should not link to the list item (as the OOTB LookUp does) but link to another link provided in another column in the referenced lookup list for that particular Lookup value and the display should show other columns' information from that list as well.
Is it possible to just change the 'Display Pattern' in the custom Lookup and use the OOTB Edit pattern? If yes, Could someone be grateful to show me how that would be set in code? Would I be overriding the 'DefaultTemplatename' with my own in the Display control mode?
Or is there another way to change the display links on the Lookup column and show more information?