max chartarea when maxmize chart window

https://social.msdn.microsoft.com/Forums/en-US/0c4ba902-b1bd-489f-ab09-ed40d2663115/chartarea-alignment-and-resize?forum=MSWinWebChart


This was working fine when I was maximizing the form and everything

      this.chart1.ChartAreas.Add(chartArea1);
            this.chart1.Dock = System.Windows.Forms.DockStyle.Fill;



How can I set a relative size for the first and second chartareas (maybe the first chart area fills 3/4s of the page and the sceondary one fills a quarter of the whole area) and ensure that the chart size changes accordingly when the form is maximized or resized?

Dim chartArea1Height As Single = 3/4 * 100 '%
 Dim chartArea2Height As Single = 100 - chartArea1Height

 chartArea1.Position = New ElementPosition(0, 0, 100, chartArea1Height)
 chartArea2.Position = New ElementPosition(0, chartArea1Height, 100, chartArea2Height)