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Make an icon for a behaviour appear after upgrade?

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Nov 5, 2008
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I have added a behaviour to a unit and I´ve made an upgrade for it. The behaviour starts to work when the upgrade is researched. Everything works fine.

I use an icon on the unit to show what the behaviour does. I want it to be dark when the upgrade is not researched plus that it shall say "- requires upgrade X".
Like on a normal ability button for a unit.

How do I do this?
 
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