This is probably the weakest, least technical question that stackoverflow has ever embraced. I want to use the control shown – the straight line that splits the buttons in the following image:

What is this control called? Any help here would be appreciated because I cannot find out what exactly I want!?
Unless you create your own control and use the graphics classes to draw the line, a lot of people just use a label with a fixed height and border:
Draw horizontal divider in winforms