In silverlight 4.0 selection does not change

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Silverlight

Hi,
I am facing an issue with selection change. I have almost 8 columns in my grid which also contains a rowdetail template. The isse occures in selection change when there are two same ID's for the first column. I have a button in second column which loads the row detail template.the row selection changes when I click on gthe row button. But if the ID's in the first column is same(which is valid in my senario) the selection is always pointed to the first record even though I want to select another duplicate ID records.