I tried this, got some problems yet,

My problem : I have a table with 7 columns. The values in column 5 depend on column 2 . If the col.2 value is "C", col 5 should show a combo box with 3 items in it. In the grid, only col 5 should have combo boxes.
When I created grid, using grid builder, it created a text box for col 5.
Instead of text box, I want a combo box.

If col 2 is 'N', col 5 should have different set of items in combo box.

Whatever the user selects from combo box, it should store into that field of the table.

I did it using one combo box, and placing it runtime at the place I wanted, that is in the active cell , by assigning left,right,top,height etc. (with some calculation) . It is working pretty fine, but is very tire some, Any good way of doing it.