Adding cell to the tble

[simon]

I have table with rows:

<asp:Table Runat="server" ID="tbl_MPlan">
<asp:TableRow Runat="server" ID="Tablerow0"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow1"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow2"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow3"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow4"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow5"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow6"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow7"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow8"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow9"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow10"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow11"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow12"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow13"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow14"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow15"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow16"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow17"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow18"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow19"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow20"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow21"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow22"></asp:TableRow>
<asp:TableRow Runat="server" ID="Tablerow23"></asp:TableRow>
</asp:Table>
Now I would like to add the cells when page_onload event is fired:

Dim c As New TableCell
c.Text = "uuuu"
tbl_MPlan.Rows(0).Cells.Add(c)
tbl_MPlan.Rows(1).Cells.Add(c)
tbl_MPlan.Rows(2).Cells.Add(c)
tbl_MPlan.Rows(3).Cells.Add(c)
....
....

But only 1 cell is added.
Why?