Hi Wye Jin,
By default if you are editing an AddNew record and on clicking the button (unless the Button.CausesValidation is set to false), the data will be updated to the DataTable. Calling the Table.EndEdit() will take care of the issue. Also in addition to that try calling:
this.gridGroupingControl1.Table.CurrentRecordManager.EndEdit();
I tried reproducing the similar behavior in the attached sample. You could see when the new record is added, changes are reflected in the other Grid which is bound to the same DataTable. Can you help us reproduce the issue in the sample? Also what version of the Grid are you using?
Best regards,
Jay
forum_43881.zip