The Align Vertical Center tool enables you to manipulate 2 or more selected objects so that they vertically align through the center of the center-most object. VTS treats the center-most object as the anchor and moves the other objects accordingly.
To align selected objects along their vertical centers, select the objects and click the Align Vertical Center button.

In the example below, the blue square and the red triangle will change position so as to align with the vertical center of the yellow circle. The shapes are framed within a box to help demonstrate their position.
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The yellow circle is the most central object. |
Select the objects. |
Click the Align Vertical Center button. |
The blue square and red triangle adjust themselves to align with the vertical center of the yellow circle. |