Basic user interface application

Questions
1

Nowadays I am working on Mathematica software. I would like to make a user interfaced application by using GUIKit library. In my application there is two fields , one is input argument field the other one is output field. There is also one button to text input value to the output field. Unfortunetaly I couldn’t get the input field value. I am attaching my script codes to here. What should I write to “???” field ?

Needs["GUIKit`"]
ref = GUIRun[
  Widget["Panel",
   {Widget["Label", {"text" -> "Enter the Inputs"},
        WidgetLayout -> {"Alignment" -> Center}, 
     Name -> "mainLabel"],
    {Widget["Label", {"text" -> "Temperature:"}],
     WidgetAlign[],
     Widget["TextField", {"columns" -> 20 },Name->"temparg"],
     WidgetAlign[],
     Widget["Label", {"text" -> "K"}]},
     
     {Widget["Label", {"text" -> "Value:"},
     WidgetLayout-> {"Alignment" -> Left}],
     WidgetAlign[],
     Widget["TextField",{"preferredSize"->Widget["Dimension",{"width"->150,"height"->20}],"editable"->False},
     WidgetLayout->{"Alignment"->Right},
     Name -> "get"]},
     
     {WidgetAlign[],
     Widget["Button", {
     
     "text" -> "Get Results",
     BindEvent["Action",Script[SetPropertyValue[{"get","text"},??????]
     ]]
     },
     WidgetLayout-> {"Alignment" -> Right}]
    } 
     }
     ]]
2

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3

Is there a reason for using GUIKit? It is no longer supported.