Header Cell with CheckBox in DataGridView

This is my version of a class that displays a check box in a DataGridView Header cell.
This is based on the code from http://social.msdn.microsoft.com/Forums/en-US/winformsdatacontrols/thread/827907ea-c529-4254-9b15-2e6d571f5c5b

It assumes that the check box is located in the first DataGridView column. It allows for column caption and provides built-in check/uncheck functionality. Play with x and y parameters to place the checkbox where you want in the header cell.

Here is a usage example:

DataGridViewColumn column = new DataGridViewCheckBoxColumn();

CheckBox ckBoxMaster = CheckBoxInHeader.CreateCheckBoxInHeader(column, 12, 4, "     Select All");

DataGridView1.Controls.Add(ckBoxMaster);

The class listing:

  class CheckBoxInHeader

    {

    public static CheckBox CreateCheckBoxInHeader(DataGridViewColumn column, int x, int y, string caption)

    {

        CheckBoxInHeader cbInHeader = new CheckBoxInHeader();

        CheckBox ckBox = cbInHeader.CreateCheckBox(column, x, y, caption);

        ckBox.CheckedChanged += new EventHandler(cbInHeader.ckBox_CheckedChanged);

        return ckBox;

    }

    private CheckBox CreateCheckBox(DataGridViewColumn column, int x, int y, string caption)

    {

        CheckBox ckBox = new CheckBox();

        //Get the column header cell bounds          

        Rectangle rect = column.DataGridView.GetCellDisplayRectangle(0, -1, true);

        ckBox.Size = new Size(18, 18);

        //play with check box position

        rect.Offset(x, y);

        //Change the location of the CheckBox to make it stay on the header

        ckBox.Location = rect.Location;

        column.Name = caption;

        return ckBox;

    }

    private void ckBox_CheckedChanged(object sender, EventArgs e)

    {

        CheckBox cb = sender as CheckBox;

        DataGridView dgv = (DataGridView)cb.Parent;

        foreach (DataGridViewRow row in dgv.Rows)

        {

            row.Cells[0].Value = cb.Checked;

        }

    }

    }

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