This is a Zen Page class. It belongs to the application
If true, then this dialog displays an Apply button.
Comma-separated list of additional JS include files for the page.
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the expression string to be parsed
Get the (localized) subtitle string for the dialog. This should be implemented in a subclass.
Get the (localized) title string for the dialog. This should be implemented in a subclass.
Get the value that will be applied when the user presses the OK button. This is implemented by subclasses.
This callback, if defined, is called when the dialog page is loaded.