datagridview - C# : 2 combobox column Data Grid View -


i working on c# project. have datagridview combobox column include, far :). can find code below. add 2 choices when click (see image below). how can do? have track me?

ps: french, excuse me english level ^^ child.

schema

code : 

datagridviewcomboboxcolumn cmb = new datagridviewcomboboxcolumn();  cmb.headertext = "opérateur";            cmb.name = "cmb"; cmb.maxdropdownitems = 3; cmb.items.add("florence"); cmb.items.add("julie"); cmb.items.add("christophe"); datagridview1.columns.add(cmb);


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