return values

No action	-1
OK	1
Cancel	2
Abort	3
Retry	4
Ignore	5
Yes	6
No	7

caption - string
the caption of the message

boxstyle - int
When adding numbers to create a final value for the boxstyle argument, use only one number from each groupcolor.

OKOnly	0	Displays OK button only.
OKCancel	1	Displays OK and Cancel buttons.
AbortRetryIgnore	2	Displays Abort, Retry, and Ignore buttons.
YesNoCancel	3	Displays Yes, No, and Cancel buttons.
YesNo	4	Displays Yes and No buttons.
RetryCancel	5	Displays Retry and Cancel buttons.
Critical	16	Displays a critical Message icon.
Question	32	Displays Warning Query icon.
Exclamation	64	Displays Warning Message icon.
Information	128	Displays Information Message icon.
DefaultButton1	0	First button is default.
DefaultButton2	256	Second button is default.
DefaultButton3	512	Third button is default.

title - string
the title of the message box

width - int
width in pixels

height - int
height in pixels