Bring To Front, Send To Back Commands (Edit Menu)
Bring To Frontmoves the selected control to the front of all other objects.
Send To Backmoves the selected control behind all other objects.
Note These commands work only with selected controls at design time . In code, you can use the ZOrder method to move forms to the front or back of other forms, and controls to the front or back of other controls.
Chapter 15, "Creating Graphics for Applications"