Calls {@link Ext#apply Ext.apply} for all fields in this form with the passed object.
@param {Object} obj The object to be applied
@return {Ext.form.Basic} this
function(obj) {
        var fields = this.getFields().items,
            f,
            fLen   = fields.length;

        for (f = 0; f < fLen; f++) {
            Ext.apply(fields[f], obj);
        }

        return this;
    }