The sub-menu item value is editable when the control icon which is in
yellow highlight is at the back of the item value.
The control icon of the main menu has the following status when in different
positions, as shown in the red rectangle of the following figures:
when in the main menu, it shows that this menu item is selected, as
shown in Figure 5.1-3:
Figure 5.1-3 A Main Menu Item Is Selected
when in the sub-menu item, it shows that this sub-menu item is
selected, and the control icon is displayed as a yellow rectangle in front
of it, as shown in Figure 5.1-4:
Functionality of the Main Menu
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