creating button programiticaly and its Click event

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ASP.NET

when other buuton Click event fired, i want create a new button(b1) programiticaly.
b1 is created but when i Click b1 so b1 became hidden and i cant fired b1s event.
what i do so it work correctly
code is blow:

//*********************************************************************************

    protected void checkbutton_Click(object sender, EventArgs e)
    {
        Table tb = new Table();
        for (int k = 0; k < 4; k++)
        {
            TableRow tr = new TableRow();
            TableCell tch = new TableCell();
            tr.Cells.Add(tch);
            for (int j = 0; j < 10; j++)
            {
                TableCell tc = new TableCell();
                Button b1 = new Button();
                b1.Text = ((j + 1) + (k * 10)).ToString();
                b1.Click += new EventHandler(b1_Click);
                tc.Controls.Add(b1);
                tr.Cells.Add(tc);
            }
            tb.Rows.Add(tr);
        }
        place1.Controls.Add(tb);
    }

void b1_Click(object sender, EventArgs e)
{
    Button b2=(Button)sender;
    this.Title = b2.Text;
}