Brings up a internal dialog panel where the number of choices is determined by the optionType parameter.

Parameters:

parentComponent     determines the Frame in which the dialog is displayed; if null, or if the parentComponent has no Frame, a default Frame is used

message     the object to display in the dialog; a Component object is rendered as a Component; a String object is rendered as a string; other objects are converted to a String using the toString method

title     the title string for the dialog

optionType     an integer designating the options available on the dialog: YES_NO_OPTION, or YES_NO_CANCEL_OPTION

Returns: an integer indicating the option selected by the user

`parentComponent`		determines the `Frame` in which the dialog is displayed; if `null`, or if the `parentComponent` has no `Frame`, a default `Frame` is used
`message`		the object to display in the dialog; a `Component` object is rendered as a `Component`; a `String` object is rendered as a string; other objects are converted to a `String` using the `toString` method
`title`		the title string for the dialog
`optionType`		an integer designating the options available on the dialog: `YES_NO_OPTION`, or `YES_NO_CANCEL_OPTION`