public TreemapPlotArea()

FarPoint.Win.Chart.TreemapSeries series = new FarPoint.Win.Chart.TreemapSeries();
series.Values.AddRange(new double[] { 3.5, 1.2, 0.8, 0.6, 0.5, 1.7, 1.1, 0.7, 1.3, 2.0 });
series.Fills.AddRange(new FarPoint.Win.Chart.Fill[] { new FarPoint.Win.Chart.GradientFill(Color.Red, Color.Orange), null, null});
FarPoint.Win.Chart.StringCollectionItem collection1 = new FarPoint.Win.Chart.StringCollectionItem();
collection1.AddRange(new String[] { "1st", "", "", "", "", "", "2nd", "", "", "3rd" });
FarPoint.Win.Chart.StringCollectionItem collection2 = new FarPoint.Win.Chart.StringCollectionItem();
collection2.AddRange(new String[] { "Jan", "Feb", "", "", "", "Mar", "Apr", "May", "June", "July" });
FarPoint.Win.Chart.StringCollectionItem collection3 = new FarPoint.Win.Chart.StringCollectionItem();
collection3.AddRange(new String[] { "", "Week1", "Week2", "Week3", "Week4", "", "", "", "", "" });
series.CategoryNames.AddRange(new FarPoint.Win.Chart.StringCollectionItem[] { collection1, collection2, collection3 });
FarPoint.Win.Chart.TreemapPlotArea plotArea = new FarPoint.Win.Chart.TreemapPlotArea();
plotArea.Location = new PointF(0.2f, 0.2f);
plotArea.Size = new SizeF(0.6f, 0.6f);
plotArea.Series.Add(series);
FarPoint.Win.Chart.ChartModel model = new FarPoint.Win.Chart.ChartModel();
model.PlotAreas.Add(plotArea);
FarPoint.Win.Spread.Chart.SpreadChart chart = new FarPoint.Win.Spread.Chart.SpreadChart();
chart.Size = new Size(500, 500);
chart.Location = new Point(50, 50);
chart.Model = model;
fpSpread1.Sheets[0].Charts.Add(chart);