Usually you may want to respond in some sort when the user selects a different value - and thus causing the VALUE-CHANGED event to occur. The APPLY statement is invoking that event in your code - just like if it would have caused by the user. That way your response trigger will fire.
If you programatically change the value of a widget and want the program to respond to that change then you always have to trigger the value-changed operation yourself, otherwise it will be ignored.
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