Answer a new dialog handler (containing a label widget and
some button widgets) laid out within the given parent window.
The label widget, when it is created, is empty.
new: parent label: aLabel
Answer a new dialog handler (containing a label widget and
some button widgets) laid out within the given parent window.
The label widget, when it is created, contains aLabel.
new: parent label: aLabel prompt: aString
Answer a new dialog handler (containing a label widget, some
button widgets, and an edit window showing aString by default)
laid out within the given parent window.
The label widget, when it is created, contains aLabel.