Winforms c# - Set focus to first child control of TabPage

Question

Say I have a Textbox nested within a TabControl.

When the form loads, I would like to focus on that Textbox (by default the

Answer 1

  private void ChildForm1_Load(object sender, EventArgs e)
        {
            ActiveControl = txt_fname;

        }

i use this code it works fine on win tab control or dotnetbar supertab contrl