If canDrag is true and the control knobs include "resize" knobs then this notification
method will be fired when the user starts to drag the resize knobs of the draw item.
Methods inherited from interface com.google.gwt.event.shared.HasHandlers
If canDrag is true and the control knobs include "resize" knobs then this notification
method will be fired when the user starts to drag the resize knobs of the draw item.