jqgrid cell edit with cellsubmit type 'remote' postbacks everytime

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JQGrid

Hi,

I have created 3 nested level with jqsubgrid, now in inner 3rd level I want to edit a cell value, after edit all top level grids should be reloaded. All these things are working fine with following,
cellEdit: true,
cellsubmit: 'remote', // since i want to recalculate parent grids value i need on the spot edit
cellurl: 'someurlfor edit'

Now if user does not change anything in a drop-down control and move to another row than also post-back occures, I want postback on if dropdown value is changed.

Thanks, in advance.
:)