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Scrollbar not added when the number of rows exceed visible window

I have a multi-tab application with grids in tabs 1 and 2. In tab two, we initially load the grid with data on launch and have no issues with the vertical scrollbar being

displayed when we have data beyond the visible boundary of the grid.

However, this is not the case in the web data grid in tab 1. It is initially empty and we add data to the table by initially getting a datatable and then we merge to the 
existing datable and binding. Only difference is that when we reach the visible border of the grid, no scrollbar appears.

The webdatagrids are defined exactly the same in both tabs.