Default Button: Set to True to make this button the “default button” for the control. The default button is the one which is triggered when the user pushes the Return key. If you have the automatic OK button enabled in the dialog properties, normally that button would be the default.
Right Button: If set to True the control will respond to right mouse button clicks as well as left.
Close Dialog: Set to True to make this button close the dialog when it’s clicked. If set to False, nothing will happen automatically when the user clicks the button, but your script will be notified.
Return Value: If Close Dialog is set to True, this lets you specify the value that the dialog returns when it closes. For example, you might have a three buttons that all close the dialog – specifying a different return value lets you tell which one the user clicked after the dialog closes.
Border: If True the button will display a border. If set to False the button appears flat, without a border, except when the mouse is over it.
Image: Displays an image on the button. You can specify an external filename or the name of an internal icon (e.g. #about for the internal About icon). At runtime you can change this with the Control.image property.
Label: If set to true, when showing an image the button will also show a label.