Drop Down Widget unable to do action on initial value(On Selected is not calling)

i'am using dropdown widget for showing the values when the user selects any value from the drop down list saving into db and showing that as initial value , but iam facing an problem here my condition is if the user selects 'Other' from drop down list iam showing an pop up as entry text and saving in db . when it is (Other-value) coming as initial value on selecting again (Other-value) for updating (OnSelected) action is not calling and pop up is not coming . any suggestions

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