How To add a gridview to Datagridview cell

Question

I want to have a grid view like this image

I find out that I should have a gridview in datagridview cell so I tried to find how to do that.I finally find that there is not any DataGridViewcolumn type like DataGridViewTextBoxColumn and etc,So I think I must create a custom Datagridview Column..But I don't know how to create..I found this tutorial Tutorial It is about creating a custom cell but I need a grid.I don't know which class should I override in my custom column.Can you please help me find out how to fix my problem? Here is my code

public class DataGridViewGridColumn :
    DataGridViewColumn
    {
        public DataGridViewGridColumn()
        {
        }

        public DataTable  Dt;
        private bool needsRecalc = true;

        public class DataGridViewBarGraphCell :
          DataGridViewCell
        {
//Do I need to override  Paint()?
            protected override void Paint()

        }

        public void CalcMaxValue()
        {
        }
    }

Answer 1

Try SourceGrid. You can download from here.