Click EventHandler not firing

我的gridviewrow中新创建的按钮没有启动其EventHandler或RowCmd事件，然后当按下按钮后重新加载页面时，新添加的行丢失，可能是因为我无法调用BindData方法。我已经从按钮中删除了Click事件处理程序，只使用了OnRowCommand事件，但我仍然没有得到

protected void CustomGridView_DataBound(object sender, EventArgs e)
{
    int count = ((GridView)sender).Rows.Count;
    GridViewRow row = new GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Insert);
    TableCell cell = new TableCell();
    Button button = new Button();
    button.Text = "Insert";
    button.ID = "Insert";
    button.CommandName = "Insert";
    button.Click += new EventHandler(insertButton_Click);
    cell.Controls.Add(button);
    row.Cells.Add(cell);
    for (int i = 0; i < ((GridView)sender).Columns.Count; i++)
    {
        cell = new TableCell();
        cell.Controls.Add(new TextBox { ID = "Text" + i });
        row.Cells.Add(cell);
    }
    Table table = ((GridView)sender).Rows[0].Parent as Table;
    table.Rows.AddAt(count + 1, row);
}
protected void insertButton_Click(object sender, EventArgs e)
{
    lblInsert.Text = "Hello World";
}
protected void CustomGridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "Insert")
    {
        lblInsert.Text = "Hello World";
    }
}