LOV switcher proplem

In Jdeveloper 12 c , there is a bug  when you create a lov switcher.
The Bug is the display list is disabled. You cannot add or delete any display attribute in the display list as show in this image

To solve this problem , you have to edit the source of the view object by adding  this tag
 <AttrArray Name="ListDisplayAttrNames"/> inside the list binding tag
Example
     <AttrArray Name="ListDisplayAttrNames">
      <Item Value="Description"/>
      <Item Value="RefNum"/>
    </AttrArray>

see the image below




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