Thank you so much Jason for the quick response.
Here is our issue.
1. Added Notes in any of the Work Order.
2. Went to the Operation details of any of the Operation on that Work Order.
3. Pressed Transmit button on the Operation details screen.
Result :- Operation details screen closed automatically and Transmit window went behind of Work Manager application. At the same I could able to work on Work Manager.
Note :- If we remove the WorkOrderPost sub-action from the Transmit action then It works fine as expected.
Your help is much appreciated!!
-Sudhir.