why to call two times a method

sorry for my ugly english :o), but i use babelfish for traduction
i have one multiselection grid,
but when it comes called the function through the method

obj.setAction("selectionChanged", message)

I have noticed that if I select only a line the function comes called once, but if I select more lines the function comes consecutively called two times!!!

why this?
June 8,

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