How to make a building ability still usable while upgrading ?

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Dec 7, 2017
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Hello guys,
I am working on a map where I have a main building (naga town hall) that can be upgraded to Tier 2 and Tier 3. The main building has the "Summon Sea Elemental" ability but when the building is upgrading to tier 2 the ability is not visible anymore and cannot be used. Is there a way to make the ability still active and usable while the main is upgrading just like the "Call to arms" ability from human town hall that can be activated during teching ?
 
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