I created a button in xml

in JS i gave like

ListController.include({
   renderButtons: function($node) {
   this._super.apply(this, arguments);
       if (this.$buttons) {
         this.$buttons.find('.oe_edit_button').click(this.proxy('edit_def'));
       }
   },

   edit_def: function () {
            if (this.mode === 'readonly') {   
            this._setMode('edit');
            this.controlPanelProps.view.arch.attrs['editable']='top';
            }
            }
   });
but when i click the button mode is set to edit and i created an attrs editable='top'
but its not working 
can some one help me out with it
Thanks