Optional - override method to disable the toolbar control. This method gets called when a toolbar containing the control gets disabled during navigation. If the control needs to do additional sync/async taks (e.x checking on user permission) before disabling, use this to override the default behavior.
Optional - override method to enable the toolbar control. This method gets called when a toolbar containing the control gets enabled during navigation. If the control needs to do additional sync/async taks (e.x checking on user permission) before enabling, use this to override the default behavior.
Configuration object for defining new toolbar control