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dhtmlxgrid - insert column

I am trying to put check box against each row in my grid.
I have included dhtmlxgrid_mcol.js

And I am using:
grid.insertColumn(0,"Delete","ch",50);

But no check box is appearing.
Please help me out in the same.

Try to use following code:
grid.insertColumn(0,"Delete","ch[0]",50);