How to reproduce:
1. http://www.phpgrid.org/demo-center/, select Appearance>Dropdown Country City.
2. Select Punjab from first dropdown.
3. Select Lahore from 2nd dropdown.
4. Now Select Sind from first dropdown, this will reset the 2nd dropdown and '-' is selected in 2nd dropdown as there is no more 'Lahore' in options. But this should also show 'ALL' records for Sind in grid. I've to select some city, and then select the '-' option to show all records of Sind in grid.
Can I achieve the desired result?
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