WPF DataGrid Using Virtualization Mode & MultiConverter to change to cell background

Hi,

I Have a DataTable which is binding to DataGrid.

I am using the virtualization mode for load the window faster.

I am also using multiConverter (In CellStyle ) for changing the background per each cell.

Evrything is works fine, BUT when i am scroll the horizintal scrollbar all the data display INCORECT.

If i am remove the virtualization - the problem disapeared.

Any Ideas ?

Thanks,