880: Mainline

Define a prescribed close: method for your application class such that Smalltalk Express exits properly when you close your application. For example, for the calorie-dictionary application, you define close: as follows:

CalorieViewManager method definition • instance 
close: aPane 
  Smalltalk isRunTime 
    ifTrue: [(MessageBox confirm: 'Are you sure you want to exit?') 
               ifTrue: [self close. ^Smalltalk exit]  
               ifFalse: [^self]] 
    ifFalse: [^self close]