Error when using custom engine

Question

Hi.. I'm having huge problems when using a custom engine to modify the grid grouping control's appearance.

It all works rather well until I expand the nested table and move my mouse over it or try to scroll. At that moment I get an exception that I just can't figure out. It has something with record count.

I've tried implementing every single GetCount method - basically I invoke the base.GetCount() (visible, record, filtered.. whatever) but the exception is always the same. But whether I do it or not nothing changes.

I've attached the stack trace so maybe you could figure it out.

Please help me - I'm starting to freak out here.

StackTrace.zip

haneefm · Answer

Hi Vicko,Generally, this exception occurs when the invoked method are not implemented in the derived classes. We are not sure about the cause of this issue in this case, please update us more details like your custom engine file or a minimal sample with this issue. It helps us to review the exception and get complete details about the cause of the exception. So, we can suggest you better solution at the earliest.Here is a KB Article that shows you "How do I efficiently customize the child table/group by using a custom engine?"http://www.syncfusion.com/support/kb/grid/Default.aspx?ToDo=view&questId=363Best regards,Haneef