Types of Canvases

Content Canvas (Default Canvas) [A content canvas is the required on each window you create]
Stack Canvas [you can display more then one stack canvas in a window at the same time]
Tab Type Window [In Tab canvas that have tab pages and have one or more then tab page]
Toolbar Canvas [A toolbar canvas often is used to create Toolbar Windows. There are two type of Toolbar window.
Horizontal Toolbar Canvas: - Horizontal Toolbar canvases are displayed at the top of the window, Just under the Main Menu Bar.
Vertical Toolbar Canvas: - While vertical Toolbar are displayed along the Left Edge of the window.