Let discuss real time scenario. In one of my custom SSRS report, Client wants to open Saleorder form by clicking on Customer Account, By default it leads to customer detail form. I used following link to build this functionality.
If you read the Microsoft link on TechNet in one of above. It also described the way to call the form, whose reference method is not include in existing Drill through Common Helper class of SRSDrillThroughtCommon project.
But one thing is missing. What if the targeted form did not have code to catch coming record and did not show the desired result. For this we have to add some customization or add code to read upcoming record.
With following line of code you can catch SSRS passed record with Element.args().lookupRecord().