Bug 41927 [Dialogs] Selecting in PreferenceDialog generates too many invalid entries
20030825 If you select an entry, close the dialog and then reopen it selecting anotehr entry will result in a "this page has invalid values" although you selected nothing.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferencePage.java
/**
	 * The <code>PreferencePage</code> implementation of this method 
	 * declared on <code>DialogPage</code> updates the container.
	 */
	public void setMessage(String newMessage, int newType) {
		super.setMessage(newMessage, newType);
		if (getContainer() != null) {
			getContainer().updateMessage();
		}
	}
	/**
	 * Sets the preference store for this preference page.
	 * <p>
	 * If preferenceStore is set to null, getPreferenceStore
	 * will invoke doGetPreferenceStore the next time it is called.
	 * </p>
	 *
	 * @param store the preference store, or <code>null</code>
	 * @see #getPreferenceStore
	 */
	public void setPreferenceStore(IPreferenceStore store) {
		preferenceStore = store;
	}
	/* (non-Javadoc)
	 * Method declared on IPreferencePage.
	 */
	public void setSize(Point uiSize) {
		Control control = getControl();
		if (control != null) {
			control.setSize(uiSize);