code: function() {
          Ext.suspendLayouts();
  
          var me     = this,
              fields = me.getFields().items,
              f,
              fLen   = fields.length;
  
          for (f = 0; f < fLen; f++) {
              fields[f].clearInvalid();
          }
  
          Ext.resumeLayouts(true);
          return me;
      }
docs: Clears all invalid field messages in this form.
  @return {Ext.form.Basic} this