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Make a Checkbox in header select all / deselect all

Hi,
We are currently evaluating the dhtmlxGrid software and so far think its fantastic, however we have hit a small snag.

I want to make the checkbox in our header select / deselect all checkboxes in one column

our header column is

<column width="28" type="ch" align="center" >
<![CDATA[<input type="checkbox" onclick="(arguments[0]||window.event).cancelBubble=true;">]]>
</column>

This displays the checkbox, but I have no clue on how to make it interact with the checkboxes in its corresponding column

Can you help?

Thanks
Joe

To deselect all checkboxes in some column next code can be used

    grid.forEachRow(function(id){
       grid.cells(id,INDEX).setValue(0);
    });


where INDEX - index of necessary column