How to make get a static chart in mxml ?

Hi

I am using the same ArrayCollection variable to display a resultset(dataprovider) in Datagrid as well as in LineChart. Whenever I sort a column in Datagrid the LineChart also changes. How can I make the LineChart look static even if I change the order of values in DataGrid ?

I am using Flash Builder 4.7. Can anyone help me in this ?