|Handler property holds the name of the script
function which is executed when the menu item is clicked.
VarioMenuItem.Handler = string
string - Text name of the executed script function.
The handler function has one argument and no return value. The argument is
VarioMenuItem object which is the menu item being clicked. Thus you can assign one handler
function to many menu items and take the proper actions depending on the argument.
Initially this property is empty. If you leave it this way, nothing is executed when the
menu item is clicked.
If nothing else is specified, the click function is supposed to be in currently loaded
main HTML file. If several frames are present you should use the HandlerNamespace property to
specify in which frame's file is the script function.
// .... item is assigned a value of menu item object
item.Handler = "OnFileExit";
// Executed when File|Exit is selected