A screenshot of the Diagram Toolbar with numerous callouts marked:

• Bring to Front - An icon with a white square in front of (and partially obscuring) two smaller black squares. The left-most icon on the toolbar.
• Send to Back - An icon with a white square behind (and partially obscured by) two smaller black squares. The second icon from the left on the toolbar.
• Direct Connection - An icon depicting an angled line with connection points on either end.
• Orthogonal Connection - An icon depicting a line with two ninety-degree angles in it and connection points on either end.
• Diagram Zoom In - An icon of a magnifying glass with a + symbol in the middle.
• Diagram Zoom Out - An icon of a magnifying glass with a - symbol in the middle.
• Show Navigator - An icon of a smaller rectangle inside a bigger rectangle.