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Grid Filter

If you need to force filtering by existing in-header filters, you can call
         grid.filterByAll();
If you need a input in header with custom filtering logic, you can place any custom HTML control as part of header and attach onchange|onkeypress event to it, which will call grid.filterBy

Hi,
But the problem in using this is. when you click on the input text box it will start sorting.

Just add a bit of code, to stop onclick event 
    <input onclick="(arguments[0]||event).cancelBubble=true;" ...