Bug 61313 Platform native icons not used in dialogs
N20040506 For example the 'info' icon for operations in progress, the 'error' icon when an exception occurs, and the 'question' icon when asked to confirm a resource deletion. These used to use the native icons on Windows XP but now they look quite different and non-native. This is a fairly recent regression.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
protected void cancelPressed() {
		setReturnCode(CANCEL);
		close();
	}
	/**
	 * Returns the number of pixels corresponding to the height of the given
	 * number of characters.
	 * <p>
	 * This method may only be called after <code>initializeDialogUnits</code>
	 * has been called.
	 * </p>
	 * <p>
	 * Clients may call this framework method, but should not override it.
	 * </p>
	 * 
	 * @param chars
	 *            the number of characters
	 * @return the number of pixels
	 */
	protected int convertHeightInCharsToPixels(int chars) {
		
		if (fontMetrics == null)
			return 0;
		return convertHeightInCharsToPixels(fontMetrics, chars);
	}
	/**
	 * Returns the number of pixels corresponding to the given number of
	 * horizontal dialog units.
	 * <p>
	 * This method may only be called after <code>initializeDialogUnits</code>