You can open a diagram from the Browser or from the View menu, and move between open diagrams using the tabs above the canvas or by pressing Ctrl+Tab or Ctrl+Shift+Tab.
            
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Double-click the diagram entry in the Browser.
                     
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Press Ctrl +D, or select  to open the Select Diagram dialog box, select a diagram node in the tree and click OK.
                        
                        

                     
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To access diagrams beneath package or other composite object symbols:
                        
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Select the Open Diagram tool from the Toolbox and click the  symbol.
                                 
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Press Ctrl and double-click the symbol.
                                 
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Right-click the symbol and select .
                                 
                         
                     
             
            The following diagram viewing tools are available in the Toolbox or from the View menu:
            
| 
                                 Tool 
                             | 
                                 Description 
                             | 
                                 
                             | 
                                 Zoom In (F6) - Select the Zoom In tool and click anywhere in the diagram. The point clicked on is centered. 
                                Alternatively, you can select , or turn your mouse scroll wheel away from you while holding the Ctrl key. 
                                To zoom in to a particular area, select the Zoom In tool and click and drag a rectangle around the area to be displayed. When you release the mouse button, the diagram zooms to the selected area. 
                             | 
                                 
                             | 
                                 Zoom Out (F7) - Select the Zoom Out tool and click anywhere in the diagram. The point clicked on is centered. 
                                Alternatively, you can select , or turn your mouse scroll wheel towards from you while holding the Ctrl key. 
                             | 
                                 
                             | 
                                 View the whole diagram (F8) - Double-click the Global View tool or select . 
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| 
                                 [none] 
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                                 View actual size (F5) - Select . 
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                                 [none] 
                             | 
                                 View the current (printable) page (Ctrl+F10) - Select . 
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| 
                                 [none] 
                             | 
                                 View all pages that contain symbols (F10) - Select . 
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                                 [none] 
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                                 View all pages in the diagram - Select . 
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| 
                                 [none] 
                             | 
                                 Center on selected symbols - Select . 
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                                 [none] 
                             | 
                                 Return to previous view (F9) - Select . 
                                This and the Next View option allows you to toggle back and forth between various selections and zooms you have used to navigate in your diagram, for example between a limited view and a global view of the diagram. 
                             | 
| 
                                 [none] 
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                                 Go to next view (Shift+F9) - Select . 
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                                 [none] 
                             | 
                                 Refresh View (Shift+F5) - Select . 
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