Defines a modal window that block events from being delivered to its
entire owner window hierarchy.
Note: A Stage with modality set to WINDOW_MODAL, but its owner is null,
is treated as if its modality is set to NONE.
Returns the enum constant of this class with the specified name.
The string must match exactly an identifier used to declare an
enum constant in this class. (Extraneous whitespace characters are
not permitted.)
Parameters:
name - the name of the enum constant to be returned.