Vertex Display Feedback Object.
The VertexFeedback object allows one or more individual segments to be moved on the display by the user. Like the NewMultiPointFeedback, the VertexFeedback does not return an object at the end of the operation and is used for visual feedback only. The segments in question donít need to belong to the same geometry or even type of geometry. This allows, for example, a segment from a polygon to be moved along with some segments from a polyline or, alternatively, the moving of vertices (and segments) that are part of a shared polygon boundary.
Vertex feedbacks are used to alter paths and rings by moving their vertices and any adjacent segments. Segments are added one by one with either their FromPoint or ToPoint as an anchor. Multiple segments, which may come from different geometry objects, can be moved at the same time. No geometry objects are returned on completion.