Probleme mit Komponenten

[Avax2k]

wenn ich einfach das Anwendungsbeispiel einfüge:

PieChart pieControl = new PieChart();
// add an item with weight 10, color Red,
// text "Text", and tool-tip text "ToolTipText"
pieControl.Items.Add(new PieChartItem(10,
Color.Red, "Text", "ToolTipText"));
// add another item with weight 5, color Blue, text "Blue",
// tool-tip text "BlueTips", and an offset
// of 25 pixels from the center of the pie
pieControl.Items.Add(new PieChartItem(5,
Color.Blue, "Blue", "BlueTips"));
// set the control to automatically
// fit the pie inside the control
pieControl.AutoSizePie = true;
// set the control to only show the
// text if it fits inside its slice
pieControl.TextDisplayMode =
PieChart.TextDisplayTypes.FitOnly;

da meckert er schon, dass er PieChart nicht kennt und PieChartItem auch nicht so sind die Fehlermeldungen:
Error 1 The type or namespace name 'pieChart' could not be found (are you missing a using directive or an assembly reference?)

Error 2 The type or namespace name 'pieChartItem' could not be found (are you missing a using directive or an assembly reference?)