Toggles not working

[ArthurJahn]

The toggles option is not working. I tried the following and never clears the last selected option.

   <paper-buttons-group attr-for-selected="name" selected="{{element.operation}}">
       <paper-button name="loaned">to loan</paper-button>
       <paper-button name="sold">to sell</paper-button>
       <paper-button name="inactive">Inactive</paper-button>
   </paper-buttons-group>

the only way to make it work is with the multi flag and slicing array to always have length of 1