I have a dynmaically created gridview in rowcreated event of another grdview.how do I find control of textbox in dynamically created gridview

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Gridview

ASP.NET4

i have a gridview which is dynamically created inside another grid.there is a textbox inside the dynamically created grid.how do i access that textbox

protected void GridView2_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
GridViewRow HeaderGridRow = new GridViewRow(0, 1, DataControlRowType.Header, DataControlRowState.Normal);
TableCell HeaderCell = new TableCell();

HeaderCell.Text = "";
TextBox abc = new TextBox();
HeaderCell.Controls.Add(abc);
HeaderCell.ColumnSpan = 3;
HeaderGridRow.Cells.Add(HeaderCell);

HeaderCell = new TableCell();
HeaderCell.Text = "";
TextBox search = new TextBox();
search.ID = "search1";
HeaderCell.Controls.Add(search);
HeaderCell.ColumnSpan = 3;
HeaderGridRow.Cells.Add(HeaderCell);
Control ctrl = HeaderGridRow.Cells[1].Controls[0];
TextBox tc = ctrl as TextBox;


HeaderCell = new TableCell();

Button btn_chk = new Button();
btn_chk.Text = "go";
HeaderCell.Controls.Add(btn_chk);
HeaderCell.ColumnSpan = 1;
btn_chk.Click += new EventHandler(btnClick);
HeaderGridRow.Cells.Add(HeaderCell);

//tbl1.Controls.Add(HeaderGridRow);

//btn_chk.CommandName = "btn_chk";

GridView2.Controls[0].Controls.AddAt(0, HeaderGridRow);
//GridView2.Controls[0].Controls.AddAt(0, tbl1);


}
}

What I have tried:

i tried to find control using many ways but no luck.