Bug 63255 [Preferences] some pages cannot be displayed in high contrast
STEPS 1) Switch to High Contrast by selecting Window->Control Panl->Accessibility Resources 2) Start Eclipse 3) Open the preferences page 4) Select Colors and Fonts 5) Select a diffrent page 6) new page not displayed.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
* Shows the "Page Flipping abort" dialog.
	 */
	void showPageFlippingAbortDialog() {
		MessageDialog.openError(getShell(), JFaceResources
				.getString("AbortPageFlippingDialog.title"), 
				JFaceResources.getString("AbortPageFlippingDialog.message")); 
	}
	/**
	 * Updates this dialog's controls to reflect the current page.
	 */
	protected void update() {
		
		updateTitle();
		
		updateMessage();
		
		updateButtons();
		
		setSelectedNode();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.preference.IPreferencePageContainer#updateButtons()
	 */
	public void updateButtons() {
		okButton.setEnabled(isCurrentPageValid());
	}
	/*
	 * (non-Javadoc)