c# - winforms devexpress GridView value loses focus on unbound column -

i have cell inside of devexpress gridview. cell contains comboboxrepositoryitem inside of it, when loses focus value reset. on selectedindexchange, combobox changes lookandfeel of app. changed e.column.unboundtype string or object , added customunboundcolumndata event. event never fires. here code looks like.

private void gridview1_customunboundcolumndata(object sender, devexpress.xtragrid.views.base.customcolumndataeventargs e)         {             if (e.column.fieldname == "value" && e.issetdata)             {                 _userentereddata = e.value.tostring();             }             else if (e.column.fieldname == "value" && e.isgetdata)             {                 e.value = _userentereddata;             }         }