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Hi again, I tried, mygrid._drawTooltip=function(){return true;}; before and after init() and also after grid gets fully loaded but its not working,Please give some solution. Thanks for your suggestions

The solution with _drawTooltip was really not universal , to solve problem in all situations instead of it add next line of code BEFORE grid constructor

dhtmlXGridObject.prototype._drawTooltip=function(){return true;};

Please check attached sample