Yes, it is possible, you should just replace ColumnSeries
by BarSeries
:
<toolkit:Chart Height="400" Width="600" Title="Mered data" >
<toolkit:BarSeries ItemsSource="{Binding AverageImpressionLengths}"
IndependentValueBinding="{Binding SeqName}"
DependentValueBinding="{Binding Time}" />
</toolkit:Chart>