Issue with selecting multiple elements with Data-Shapes UI nodes

I am trying to create a UI that prompts the user to select multiple elements. I can not seem to get Data-Shapes’ “UI.SelectModelElements Data” node to work when selecting more than one element. Please see gig and screen shot below. What am I doing wrong? Any help would be appreciated.

2017-09-06_8-40-31

hi @jmmiller ,
I think you’re using an old version of the package and you press the “set values” button before clicking the “finish” button in Revit. In the latest version of the package the form doesn’t allow this mistake because it freezes untill you press finish.
select multi

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Thank You @Mostafa_El_Ayoubi. Your suggestions did the trick.