<Chart:C1Chart Name="chart">
<Chart:C1Chart.Data>
<Chart:ChartData>
<Chart:ChartData.LoadAnimation>
<!-- load animation -->
<Chart:PlotElementAnimation>
<!-- initial style: invisible  -->
<Chart:PlotElementAnimation.SymbolStyle>
<Style TargetType="Chart:PlotElement">
<Setter Property="Opacity" Value="0" />
</Style>
</Chart:PlotElementAnimation.SymbolStyle>
<Chart:PlotElementAnimation.Storyboard>
<Storyboard >
<!-- display element with index delay -->
<DoubleAnimation
Storyboard.TargetProperty="Opacity"
Chart:PlotElementAnimation.IndexDelay="0.5"
To="1" Duration="0:0:1" />
</Storyboard>
</Chart:PlotElementAnimation.Storyboard>
</Chart:PlotElementAnimation>
</Chart:ChartData.LoadAnimation>
</Chart:ChartData>
</Chart:C1Chart.Data>
</Chart:C1Chart>

var rnd = new Random();
chart.PointerReleased += (s, e) =>
{
chart.Data.Children.Clear();
// create new data
var vals = new double[rnd.Next(5,10)];
for (int i = 0; i < vals.Length; i++)
vals[i] = rnd.Next(0,100);
chart.Data.Children.Add( new DataSeries() { ValuesSource = vals });
};