RadGridview slow scrolling

[JJ Loubser]

we have done all this but still slow scrolling and stuck:

• The GridView is placed in a control that measures its children with infinity - such controls are ScrollViewer, StackPanel (when vertical it measures with infinite height and when horizontal - with infinite width), and Grid with RowDefinition Height="Auto" or ColumnDefinition Width="Auto". When RadGridView (or any other grid) is measured with infinity virtualization is turned off which results in reduced performance. Modify your code so that RadGridView is placed in a container that will not measure it with infinity and the performance will be back to normal.
• Binding to complex properties - If you bind to complex property (sub property) the RadGridView have to use bindings to get the value for the cell. The better performance will be achieved if you bind to a simple property because we will use lambda to get the value. Using lambdas is much faster than bindings.
• Converters - using converters will slow you down because RadGridView will call them.
• CellTemplates - using CellTemplates is a time consuming operation. If applicable, try to stick to the Default Templates.
• AlternateRowStyle - using AlternateRowStyle is a time consuming operation. If you just need to set the background of the alternating rows we recommend using the AlternateRowBackground property.
• RowStyle - using the RowStyle is a time consuming operation (but was the only alternative in Silverlight 3). Please use implicit styles

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could it be our implicit styles, we change some colors only?
could it be that we are still using version 2011.1.419.1040?