Problem with MS Chart control while assigning width to chart

Hi, I'm not sure are making your charts, but have a look at this article to see how you can create Excel charts in C#.
For example let's say you have defined the following chart control:

// Create chart.
var chart = sheet.Charts.Add(ChartType.Bar, "D2", "M25");
// Select data for it.
chart.SelectData(sheet.Cells.GetSubrange("A1", "D5"), true);

And later on you want to change its width, you would just need to use something like the following:

// Double a chart's size.
chart.Position.Width *= 2;
chart.Position.Height *= 2;

Note that this API comes from this excel's component for a C# code.