"Buddy" property inToolbarControl or TOCControl.

JcsonJcson

Hi, my friends,I am new to the ArcEngine,but counld you launch me what's done when the Buddy property of ToolbarControl is set to a MapControl.
Here is the code:

 private void Form1_Load(object sender, EventArgs e) {
            toolbar.SetBuddyControl(map_main);//Set the MapControl as the Buddy control of ToolBar.
            toc.SetBuddyControl(map_main);
        }

The toolbar is not active when I add the two sentence codes when the form loads.But when I manual set the Buddy property of the  ToolBar,you know that,when the ToolBar is activate when running the App. Or this two actions do not do the same work? I always think that they do the same work,is'n it?
Thanks for your time.