How to repair custom widget

i want to repair a custom widget its “Custom DropDown” i have to use external DB so this dropdown really helpful but theres one big problem, the display for default isnt changing and cant be change, i use it and it store the right data, but for user when they use it the dropdown display wont change after the pick the option , i have to repair it but its file is an .mpk package is there a way for me to code it,, or is there any other solution to this ?? 
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