Bug 26109 [Dialogs] Need a FormData version of the button sizing API
The button sizing API in Dialog assumes the developer wants a GridData. We should promote the FormData version in PathVariablesDialog to Dialog.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
/**
	 * Image registry key for error image (value <code>"dialog_error_image"</code>).
	 */
	public static final String DLG_IMG_ERROR = "dialog_error_image";
	/**
	 * Image registry key for info image (value <code>"dialog_info_image"</code>).
	 */
	public static final String DLG_IMG_INFO = "dialog_info_image";
	/**
	 * Image registry key for question image (value <code>"dialog_question_image"</code>).
	 */
	public static final String DLG_IMG_QUESTION = "dialog_question_image";
	/**
	 * Image registry key for warning image (value <code>"dialog_warning_image"</code>).
	 */
	public static final String DLG_IMG_WARNING = "dialog_warning_image";
	
	
	/**
	 * Image registry key for info message image (value <code>"dialog_messsage_info_image"</code>).
	 * @since 2.0
	 */
	public static final String DLG_IMG_MESSAGE_INFO = "dialog_messasge_info_image";
	/**
	 * Image registry key for info message image (value <code>"dialog_messasge_warning_image"</code>).