class counterpart of mel function confirmDialog
The confirmDialog command creates a modal dialog with a message to the user and a variable number of buttons to dismiss the dialog. The dialog is dismissed when the user presses any button or chooses the close item from the window menu. In the case where a button is pressed then the name of the button selected is returned. If the dialog is dismissed via the close item then the string returned is specified by the dismissStringflag. The default behaviour when no arguments are specified is to create an empty single button dialog.