QTableView strange behavior after editing

[mbnoimi]

After finishing edit any new row then pressing ENTER QTableView hides the data from the new row and shows "!" character in Vertical header of that row although it added physically in the database table!!

@tableModel->insertRow(tableModel->rowCount());@

how can I fix this issue?!

!http://img824.imageshack.us/img824/6308/snapshot13y.png(QTableView)!