Page History
...
The OnInvalidData event fires when the user attempts to update a cell containing invalid data by navigating to another cell or leaving the table altogether. Data is considered invalid when the data in the cell does not match the validation pattern specified for that cell.
...
The parameters are all provided for convenience. In particular, you may find the Message parameter useful if you want to manually display your own popups while conveniently storing cell-specific messages in the table itself (to avoid the use of case statements, for example).
