[RM#4508] Fix tab navigation issue with Backgrid Datetime cell

[Murtuza Zabuawala]

Hi,

PFA minor patch to fix the tab navigation issue with Backgrid datetime cell.

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Regards,
Murtuza Zabuawala
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

fix_datetime_backgrid.diff
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