RequiredFieldVa lidator has no action

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I want to combine a TextBox and a RequiredFieldVa lidator into to a web
custom control (name RequireTextBox ),
But when I use RequireTextBox in web form, the RequiredFieldVa lidator has no
action.
How can I do?
{
private TextBox box;
RequiredFieldVa lidator rv;
public string Text
{
get
{

return box.Text;
}
set
{
box.Text = value;
}
}

protected override void CreateChildCont rols()
{
box = new TextBox();
box.ID="box";
box.Width=30;
Controls.Add(bo x);

rv= new RequiredFieldVa lidator();
rv.ControlToVal idate="box";
Controls.Add(rv );
}
}

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Sorry, I forget some code in last post.

I want to combine a TextBox and a RequiredFieldVa lidator into to a web
custom control (name RequireTextBox ),
But when I use RequireTextBox in web form, the RequiredFieldVa lidator has no
action.
How can I do?

public class RequireTextBox : Control, INamingContaine r
{
private TextBox box;
RequiredFieldVa lidator rv;
public string Text
{
get
{

return box.Text;
}
set
{
box.Text = value;
}
}

protected override void CreateChildCont rols()
{
box = new TextBox();
box.ID="box";
box.Width=30;
Controls.Add(bo x);

rv= new RequiredFieldVa lidator();
rv.ControlToVal idate="box";
Controls.Add(rv );
}
}