Bug 137315 [Dialogs] Doubleclickable area to restore dialog size is often very small
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
* Returns the standard dialog image with the given key. Note that these
	 * images are managed by the dialog framework, and must not be disposed by
	 * another party.
	 * 
	 * @param key
	 *            one of the <code>Dialog.DLG_IMG_* </code> constants
	 * @return the standard dialog image
	 */
	public static Image getImage(String key) {
		return JFaceResources.getImageRegistry().get(key);
	}
	/**
	 * Returns the button created when <code>createButton</code> is called
	 * with an ID of <code>IDialogConstants.OK_ID</code>. If
	 * <code>createButton</code> was never called with this parameter, or if
	 * <code>createButton</code> is overridden, <code>getOKButton</code>
	 * will return <code>null</code>.
	 * 
	 * @return the OK button or <code>null</code>
	 * 
	 * @see #createButton(Composite, int, String, boolean)
	 * @since 2.0
	 * @deprecated Use <code>getButton(IDialogConstants.OK_ID)</code> instead.
	 *             This method will be removed soon.
	 */
	protected Button getOKButton() {
		return getButton(IDialogConstants.OK_ID);
	}
	/**
	 * Initializes the computation of horizontal and vertical dialog units based