Suppose I have this data to chart in a TreeMap:

DataTable dt = new DataTable("MyTable");
dt.Columns.Add("Severity", typeof(string));
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("Count", typeof(double));

var dr = dt.NewRow();
dt.Rows.Add(new object[] { "information", "backup completed successfuly", 20000 });
dt.Rows.Add(new object[] { "warning", "low disk space", 4 });
dt.Rows.Add(new object[] { "warning", "temperature is rising", 2 });
dt.Rows.Add(new object[] { "warning", "cpu level is high", 1 });
dt.Rows.Add(new object[] { "critical", "database has 10MB freespace left", 4 });
dt.Rows.Add(new object[] { "critical", "IIS is having too many errors", 4 });
dt.Rows.Add(new object[] { "security", "SQL Injection attack", 4 });
dt.Rows.Add(new object[] { "security", "Password attack", 2 });

If I run this code I will only see "backup completed..." rectangle since the treemap calculates the rectangle size linearly. However, if I add the following code before setting the chart's datasource, it looks fine but this time tooltips displays logarithmic values!

foreach (DataRow dr1 in dt.Rows)
{  
     dr1["Count"] = Math.Log10((double)dr1["Count"]);
}

My question; is there a way to override how TreeMapChart gets the value? or any workarounds?