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all checkboxes "unchecked" initially

How to set all checkboxes in tree-grid to "unchecked" initially?

Thanks

The state of checkboxes based on value in XML, if it has 0 as value - they will be unchecked.
Also, you can use 

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

where INDEX - index of necessary column