I am converting an 7.2 ExtJs application from classic to modern. In the conversion there is a classic combobox that has a 'beforeselect' event listener and it is checking to see if the user can select the item. If they cannot, the event returns false and the item is never selected.

There doesn't seem to be an equivalent in the modern toolkit and I've tried using onBefore( "select", this.beforeselect, this ) and returning false, but it is still selecting the item.