Tony,

If I understand your question correctly, you're asking how to make the ENTER key work like the TAB key in a textbox, so that hitting ENTER sets the focus to the next control.

Assuming this is Winforms, I do it by subclassing the textbox control, and setting up something in the OnKeyDown event. Here's a code sample...

public class ccTextBox : System.Windows.Forms.TextBox 
{
	public ccTextBox()
	{
 	   this.KeyDown	+= new KeyEventHandler(OnKeyDown);
	}

	public void OnKeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
       {
		if (e.KeyCode == Keys.Enter) 
			SendKeys.Send("{TAB}"); 
	}
}

Let me know if that helps...
Kevin