Bug 305200 [EditorMgmt] FileEditorMappingContentProvider could just be replaced by ArrayContentProvider
This class doesn't seem to be very useful.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardExportPage.java
restoreWidgetValues(); 
        if (currentResourceSelection != null) {
			setupBasedOnInitialSelections();
		}
        updateWidgetEnablements();
        setPageComplete(determinePageCompletion());
        setControl(composite);
    }
    /**
     * Creates the export destination specification visual components.
     * <p>
     * Subclasses must implement this method.
     * </p>
     *
     * @param parent the parent control
     */
    protected abstract void createDestinationGroup(Composite parent);
    /**
     * Creates the export source resource specification controls.
     *
     * @param parent the parent control
     */
    protected final void createSourceGroup(Composite parent) {
        
        Composite sourceGroup = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 3;
        sourceGroup.setLayout(layout);
        sourceGroup.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL
                | GridData.HORIZONTAL_ALIGN_FILL));