Fires before the callback is initiated by the canvas.
Namespace:
Aurigma.GraphicsMill.AjaxControls.VectorObjects
Assembly:
Aurigma.GraphicsMill.AjaxControls.VectorObjects (in Aurigma.GraphicsMill.AjaxControls.dll)
function add_invokingCallbackRequest(value); function remove_invokingCallbackRequest(value);