Fires before v-object is being modified (before the start of an operation).
Namespace:
Aurigma.GraphicsMill.AjaxControls.VectorObjects
Assembly:
Aurigma.GraphicsMill.AjaxControls.VectorObjects (in Aurigma.GraphicsMill.AjaxControls.dll)
function add_changing(value); function remove_changing(value);