Split a polygon feature with a digitized line in QGIS

It is possible to split a polygon feature by interactively drawing a line over it in QGIS 2.0 with the Split Feature command. The command doesn't seem to be accessible from the menus and only available as a tool bar item in the Advanced Digitizing tool bar palette. The following shows how to access it to split a polygon.

1. Start QGIS 2.0. Load and display a vector layer e.g. mask.shp.
   
   
   
2. Select View | Toolbars. Toggle on Advanced Digitizing.
   
   
   
   The Advanced Digitizing tool bar is displayed.
   
   
3. In the Layers pane, select the polygon layer. Then select Layer | Toggle Editing.
   
   The polygon layer is enabled for editing.
   
4. Click the Split Feature icon.
   
   
   
5. Digitize a line over a polygon feature.
   
   
   
6. Right click to complete the line.
   
   The polygon feature is divided into parts according to the digitized line.
   
   
7. To make the change permanent, toggle off Editing mode.