protected void MeasureAndArrange()
{
XYChart xyChart = null;
object el = FindName("xyChart");
if (el is XYChart)
{
xyChart = el as XYChart;
Size size = new Size(xyChart.Width, xyChart.Height);
// Measure and arrange the surface
// VERY IMPORTANT
xyChart.Measure(size);
xyChart.Arrange(new Rect(size));
}
}