var MyChart : TChart;
MyChart := TChart.Create( Self );
MyChart.Parent := Self;
MyChart.Left := 100;
MyChart.Top := 50;
MyChart.Show;

You can also add series to a Chart using code:

MyChart.AddSeries( TBarSeries.Create( Self ) );

or...

MyChart.AddSeries( TLineSeries );

or...

var P : TPieSeries;
P := TPieSeries.Create( Self );
P.ParentChart := MyChart;