Description:
+Call the setDimmed method to show or hide an existing
+menu item. By default, a menu item is shown when it is appended to the options
+menu.
For more general information on constructing an options menu, see Using softkeys.
+Syntax:
+[void] MenuItem.setDimmed(Boolean flag)+
Arguments:
+flag:
true to hide the menu item, and false to
+show the menu item.
Return value:
+This method does not return a value.
+Example code:
+See the example code in the description of the MenuItem.onSelect property.