The Master object Custom_Opportunity__c have a master-detail relationship on Product__c. Normally there are many Product__c records under one Custom_Opportunity__c record. Every time I use Custom_Opportunity__c.Product__r in my VF page, it shows the newest record.
Is there a way for me to query all the children under this Custom_Opportunity__c and let the user to choose which child they want to work on? In the object layout page, all the children can be seen. However, now I want to show them in a VF page. And my major issue here is to get all children records once together.