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Grid Combo checkbox

Hi,
My code is for checkbox combo within grid is
var selectBox = new dhtmlXCombo("div_id","div_id",100,'checkbox');
selectBox .addOption([['1','ONE'],['2','TWO'],['3','THREE'],['4','FOUR']]);

but in grid combo is printed but the value for that combo not shown not even checkbox combo .Simple Combo with empty data is printed.