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The grid has method getCombo, which return collection of combobox values for selected column.

So you need to use next syntax

                mygrid.getCombo(5).put(1,"on" );

where:

                5 - is column ID

                1,"on" - label/value pair

If you haven't found the needed information there and still looking for a solution, you will find the additional help checking php upload with progress bar and java script for date.