c# create custom control - DataGridView Checkbox column

I'm attempting to create a custom control from dataGridView which includes a checkboxcolumn. I have added the code to produce this and added the newly created checkBoxDataGridView onto my form in a new project.

I have 2 problems:

1. The column gets added a 2nd time when I open and close the form that holds the new checkBoxDataGridView in designtime. You will see in my code I have tried multiple checks, now commented out, so it does not add the column during design time a 2nd time or more than once. Also only needs to add it during designtime, which I guess is no problem if I check whether its been added already.

2. The checkbox column does not instantiate the name I gave it in the controls class. eg.: col.Name = "dgvTickCol"

    public class CheckBoxDataGridView : DataGridView
    {          
        public CheckBoxDataGridView()
        {          
            AddCheckColumn();
        }

        private void AddCheckColumn()
        {
            //if (LicenseManager.UsageMode == LicenseUsageMode.Designtime)                
            //if (!Columns.Contains("dgvTickCol"))                
            //if (this.Rows[0].Cells["dgvTickCol"].Value != null)
            //if (this.Rows[0].Cells["dgvTickCol"].ColumnIndex == -1)
            //{
                DataGridViewColumn col = new DataGridViewCheckBoxColumn();            
                col.Name = "dgvTickCol";
                col.HeaderText = "";
                col.SortMode = DataGridViewColumnSortMode.NotSortable;
                Columns.Add(col);            
            // }

    }
}