using System;
using System.Drawing;

using NineRays.Windows.Forms.Grids;
using NineRays.Windows.Forms.Data;
using NineRays.Windows.Drawing;

namespace flygrid
{
  public class CustomButtonColumn : ButtonColumn
  {
    public CustomButtonColumn(string name, string field) : base(name, field)
    {
      this.ButtonCaption = "";
    }

    public override void PaintCellValue(CellDrawInfo dci)
    {
      base.PaintCellValue (dci);

      //Do whatever you need to do to determine your button caption
      System.Data.DataRowView data = dci.node.Value as System.Data.DataRowView;
      if(data!=null)
      {
        string text = data["Caption"].ToString();
        // Custom paint of Caption
        dci.g.DrawString(text, dci.Font, new SolidBrush(ForeColor), dci.cellRect);
      }
    }
  }
}

[C#]
private void ModifyNodeCaption(Column col, NodeBase node, string caption)
{
  node[col] = caption;
}

[C#]
private void ModifyNodeCaption(string fieldName, NodeBase node, string caption)
{
  node[fieldName] = caption;
}