Switching between designer/editor/history view

In Delphi 2005 you can have multiple views for each editor object. For example: switching between the source code editor and the formular designer can be done using F12. But how can you switch into the history view and others without using the mouse? Well, that is actually very simple.

Using the key combinations [Alt]+[PageUp] and [Alt]+[PageDown] will switch forward or backward, respectively. I have not found that documented in the help but came across this information reading a news group entry.

Thanks :-)