New answers tagged master-details
The multi-select list is always uncomfortable to use - it doesn't naturally show that it is capable of multiple selection. I would stick to single selection when clicking on the campaign names and add a checkbox to the right of each item in the list. At the top of the column of checkboxes I would add the title "Compare". This means that the user can click ...
It's better to be consistent in the Master-Detail pattern and display the detailed info on selecting the item in the master panel. You can use Add to Compare and Compare Campaigns features for the item. It will be obvious for users.
Have you thought about simply providing a separate 'compare mode'? Checkboxes seem like a way to really identify which ones you want to compare. If I wear my 'user' glasses, I'd probably want to read something about the campaign before I decide to compare it with another one; in webshops I'm used to see some sort of "compare" button, which allows me to ...
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