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It does update when I Show or Minimize the Suggestions Bar, but I would like it to update automatically.

list = {1, 2, 3};

Dynamic[Manipulate[{If[addchoice != {}, 
AppendTo[list, Last[addchoice]]; addchoice = {}], list, 
addchoice}, {{addchoice, {}}, 
ListPicker[#1, list, Multiselection -> False] &}]]
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This is a little easier with a ButtonBar.

With

list = {1, 2, 3};
Manipulate[
 # :> AppendTo[list, #] & /@ list // ButtonBar,
 {n, None}]

n is there as a placeholder for Manipulate. No doubt this snippet will be used in a larger Manipulate. If not you can use Dynamic instead of Manipulate and remove the n bit.

Hope this helps.

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  • $\begingroup$ That is really cool! :) But I was hoping for a vertical listing with a scroll bar as the list grew. $\endgroup$ – Paul Oct 3 '16 at 6:38

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