[Serializable()]
class btnType:FarPoint.Web.Spread.ButtonCellType
{
public override ControlGetEditorControl(string id,TableCell parent,FarPoint.Web.Spread.Appearance style,FarPoint.Web.Spread.Inset margin,object v,bool ul)
{
return Base.GetEditorControl(id,parent,style,margin,v,ul);
}

public override ControlPaintCell(string id,TableCell parent,FarPoint.Web.Spread.Appearance style,FarPoint.Web.Spread.Inset margin,object v,bool ul)
{
return Base.PaintCell(id,parent,style,margin,v,ul);
}
}

private void Page_Load(object sender,System.EventArgs e)
{
btnType mybtn= new btnType();
FpSpread1.ActiveSheetView.Cells[0,0].CellType=mybtn;
}

<Serializable()>
Public Class btnType
Inherits FarPoint.Web.Spread.ButtonCellType

Public Overrides Function GetEditorControl(ByVal id As String,ByVal parent As TableCell,ByVal style As FarPoint.Web.Spread.Appearance,ByVal margin As FarPoint.Web.Spread.Inset,ByVal val As Object,ByVal ul As Boolean)As System.Web.UI.Control
Return MyBase.GetEditorControl(id,parent,style,margin,val,ul)
End Function

Public Overrides Function PaintCell(ByVal id As String,ByVal parent As TableCell,ByVal style As FarPoint.Web.Spread.Appearance,ByVal margin As FarPoint.Web.Spread.Inset,ByVal val As Object,ByVal ul As Boolean)As System.Web.UI.Control
Return MyBase.PaintCell(id,parent,style,margin,val,ul)
End Function

End Class

Private Sub Page_Load(ByVal sender As System.Object,ByVal e As System.EventArgs)Handles MyBase.Load
Dim mybtn As New btnType()
FpSpread1.ActiveSheetView.Cells(0,0).CellType=mybtn
End Sub