With this function the display of a main menu is realized. As parameters the name of a main menu and an action type are needed.
Possible actions are:
Show menu |
The selected menu is displayed. |
Hide menu |
The selected menu is hidden. |
Change menu |
The current menu is hidden and the selected menu is displayed instead. |
If no menu exists |
The selected menu is displayed, if no menu is displayed at the moment. |