How do I set focus to a text field after I click a button that calls a webservice?

I have a web service that returns back a table. In order to show the values in the table I had to check the re-merge Form Data on the Webservice Button. My question is , How do I set focus to a field on the screen after re-merge happens.

I was reading SetFocus documentation and it says
You cannot use setFocus with the form:ready, layout:ready, or initialize events.
What I need is an event like doc:ready or someother event where I can put the set focus code in. doc:ready was triggered when the form first loads which is great and I was able to put my Initial setfocus. When I pressed the button that calls the webservice and thr re-merge happened doc:ready event was not triggered so now I am not sure where to put the set focus.

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How do I set focus to a text field after I click a button that calls a webservice?

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