Dynamic Handler - how to set value for wyswig field when status changed

[LuckyLouie]

Hi,
How to dynamic set vaule on wyswig field when I change status to 'Canceled' in edit view?
I try that but it doesn't work:

define('custom:quote-dynamic-handler', ['dynamic-handler'], function (Dep) {

return Dep.extend({

init: function () {
this.controlFields();

this.recordView.listenTo(
this.model, 'change:status', this.controlFields.bind(this)
);
},

controlFields: function () {
if (this.model.get('status') === 'Canceled') {


this.model.set('mywyswigfieldname','Lorem ipsum Lorem ipsum');
this.model.save();
this.model.fetch();
}
},
});
}); 

Thanks for any help!
Lukas