Creates a non-modal dialog without a title and without a specified Frame owner. A shared, hidden
frame will be set as the owner of the dialog.
This constructor sets the component's locale property to the value returned by
JComponent.getDefaultLocale.
throws: java.awt.HeadlessException - if GraphicsEnvironment.isHeadless() returns true. See Also:java.awt.GraphicsEnvironment.isHeadless See Also:javax.swing.JComponent.getDefaultLocale