DataGrid2 Filtered Results

Hi Everyone, I have datagrid2. The user is selecting the datagrid item from changing selected attribute manually. So one by one. I also have Select/UnSelect All button with MF(That is selecting/unselecting all items).  But, The user is filtering the items according to multiple attributes. So, the user wants to select this filtered items not all items. How can I select/unselect these filtered items? I do not want manually Coz I have more than 100 items in the list.   Many thanks
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