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I may have huge combo box data, What I am doing is, when user clicks on that cell, it fires an AJAX call to populate dropdown, but it looks like when I do this

var combobox = mygrid.getCombo(cellInd);

for ( var i = 1; i < arrTM.length(data returned from AJAX) ; i++)

{                      

combobox.put(arrTM[i],arrTM[i])

}

            It populates the combo for whole column that makes my effort (populate on demand) worthless. Am I true?

Yes, this approach populates the combo for the whole column. By default the list of values is common for all combo/select boxes in the same column. You can create a custom excell, or try to use save() and restore() methods which save/restore state of combobox. Please check:

If you haven't found the needed information there and still looking for a solution, you will find the additional help checking data grid javascript and gandt chart.