How to enable snap to the middle in the ZoomTrackBarControl 

This example demonstrates how to add snap to the middle in the the ZoomTrackBarControl control. 

First, we added two properties in the custom RepositoryItemZoomTrackBar: SnapToMiddleValue that allows you to enable or disable snapping and MiddleDistance that gives you the opportunity to change the distance (as a percent) from the middle of a trackbar when snapping takes effect.