D365F&O - X++ - set display method from table extension in form control

1- Right click on the table and click "create extension" and write your display method. [ExtensionOf(tableStr(CustTrans))] final class CustTransTable_Extension { public display CustGroupId getCustGroup() { return CustTable::find(this.AccountNum).CustGroup; } } 2- Go to the control where you want to set the display method set display method as below