RadControls for Silverlight
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Since Q2 2011 Inverse Axis feature was released. It allows the axes values of RadChart to be inverted.

Note

The IsInverse property can be set independently of the Axis range - it works both with automatic range and custom one(AutoRange = false).

The following sample code will show you how this can be achieved:

CopyC#
InitializeComponent();
telerikChart.DefaultView.ChartArea.AxisY.IsInverse = true;
//Line Chart
DataSeries lineSeries = new DataSeries();
lineSeries.LegendLabel = "Turnover";
lineSeries.Definition = new LineSeriesDefinition();
lineSeries.Add(new DataPoint() { YValue = 154, XCategory = "Jan" });
lineSeries.Add(new DataPoint() { YValue = 138, XCategory = "Feb" });
lineSeries.Add(new DataPoint() { YValue = 143, XCategory = "Mar" });
lineSeries.Add(new DataPoint() { YValue = 120, XCategory = "Apr" });
lineSeries.Add(new DataPoint() { YValue = 135, XCategory = "May" });
lineSeries.Add(new DataPoint() { YValue = 125, XCategory = "Jun" });
lineSeries.Add(new DataPoint() { YValue = 179, XCategory = "Jul" });
lineSeries.Add(new DataPoint() { YValue = 170, XCategory = "Aug" });
lineSeries.Add(new DataPoint() { YValue = 198, XCategory = "Sep" });
lineSeries.Add(new DataPoint() { YValue = 187, XCategory = "Oct" });
lineSeries.Add(new DataPoint() { YValue = 193, XCategory = "Nov" });
lineSeries.Add(new DataPoint() { YValue = 176, XCategory = "Dec" });
telerikChart.DefaultView.ChartArea.DataSeries.Add(lineSeries);
//Bar Chart
DataSeries barSeries = new DataSeries();
barSeries.LegendLabel = "Expenses";
barSeries.Definition = new BarSeriesDefinition();
barSeries.Add(new DataPoint() { YValue = 45, XCategory = "Jan" });
barSeries.Add(new DataPoint() { YValue = 48, XCategory = "Feb" });
barSeries.Add(new DataPoint() { YValue = 53, XCategory = "Mar" });
barSeries.Add(new DataPoint() { YValue = 41, XCategory = "Apr" });
barSeries.Add(new DataPoint() { YValue = 32, XCategory = "May" });
barSeries.Add(new DataPoint() { YValue = 28, XCategory = "Jun" });
barSeries.Add(new DataPoint() { YValue = 63, XCategory = "Jul" });
barSeries.Add(new DataPoint() { YValue = 74, XCategory = "Aug" });
barSeries.Add(new DataPoint() { YValue = 77, XCategory = "Sep" });
barSeries.Add(new DataPoint() { YValue = 85, XCategory = "Oct" });
barSeries.Add(new DataPoint() { YValue = 89, XCategory = "Nov" });
barSeries.Add(new DataPoint() { YValue = 80, XCategory = "Dec" });
telerikChart.DefaultView.ChartArea.DataSeries.Add(barSeries);
CopyVB.NET
InitializeComponent()
Dim lineSeries As New DataSeries()
    lineSeries.LegendLabel = "Turnover"
    lineSeries.Definition = New LineSeriesDefinition()
    Dim dataPoint As New DataPoint()
    dataPoint.YValue = 154
    dataPoint.XCategory = "Jan"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 138
    dataPoint.XCategory = "Feb"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 143
    dataPoint.XCategory = "Mar"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 120
    dataPoint.XCategory = "Apr"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 135
    dataPoint.XCategory = "May"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 125
    dataPoint.XCategory = "Jun"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 179
    dataPoint.XCategory = "Jul"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 170
    dataPoint.XCategory = "Aug"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 198
    dataPoint.XCategory = "Sep"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 187
    dataPoint.XCategory = "Sep"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 193
    dataPoint.XCategory = "Nov"
    lineSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 176
    dataPoint.XCategory = "Dec"
    lineSeries.Add(dataPoint)
    telerikChart.DefaultView.ChartArea.DataSeries.Add(lineSeries)
    'Bar Chart
    Dim barSeries As New DataSeries()
    barSeries.LegendLabel = "Expenses"
    barSeries.Definition = New BarSeriesDefinition()
    dataPoint = New DataPoint()
    dataPoint.YValue = 45
    dataPoint.XCategory = "Jan"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 48
    dataPoint.XCategory = "Feb"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 53
    dataPoint.XCategory = "Mar"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 41
    dataPoint.XCategory = "Apr"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 32
    dataPoint.XCategory = "May"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 28
    dataPoint.XCategory = "Jun"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 63
    dataPoint.XCategory = "Jul"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 74
    dataPoint.XCategory = "Aug"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 77
    dataPoint.XCategory = "Sep"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 85
    dataPoint.XCategory = "Oct"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 89
    dataPoint.XCategory = "Nov"
    barSeries.Add(dataPoint)
    dataPoint = New DataPoint()
    dataPoint.YValue = 80
    dataPoint.XCategory = "Dec"
    barSeries.Add(dataPoint)
    telerikChart.DefaultView.ChartArea.DataSeries.Add(barSeries)

Note the IsInverse property of the YAxis which is false by default. Turned on it will reverse the axis. The picture shows it in action:

 

For a sample with databound Chart - take a look at our Inverse Axis demo.

Optionally you may inverse the XAxis too - it will display the categories from Dec to Jan:

CopyC#
telerikChart.DefaultView.ChartArea.AxisX.IsInverse = true;
CopyVB.NET
telerikChart.DefaultView.ChartArea.AxisX.IsInverse = true

Voila: