Bug 24586 [Dialogs] Changed initial focus behaviour
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/MessageDialog.java
if(customArea == null)
		customArea = new Label(composite,SWT.NULL);
	return composite;
}
/**
 * Gets a button in this dialog's button bar.
 *
 * @param index the index of the button in the dialog's button bar
 * @return a button in the dialog's button bar
 */
protected Button getButton(int index) {
	return buttons[index];
}
/**
 * Returns the minimum message area width in pixels
 * This determines the minimum width of the dialog.
 * <p>
 * Subclasses may override.
 * </p>
 *
 * @return the minimum message area width (in pixels)
 */
protected int getMinimumMessageWidth() {
	return convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH);
}
/* (non-Javadoc)
 * Method declared on Dialog.
 * Sets a return code of -1 since none of the dialog buttons were pressed to close the dialog.
 */