jQuery Grid Plugin - jqGrid

Hi,

I am experiencing problem with row selection (deselection), when there is no column with unique data usable as key column. When not set the grid uses the first column as the key column, because I have duplicate values in this column the row selection operation didn't work properly, so I tried to set different column as key by using the "key" property. This column is unique but it's a string consisting of numbers separated by"," (like 456798455,45979963). For some reason this didn't work either because somehow when i select one row and then select some other, the first one doesn't deselects so visually it looks like multiselect is enabled and i selected both. Any idea how to solve this?

thank you