Bug 19145 [Wizards] Make wizards resizable and keep bounds
Both the Checkbox Tree and the Checkbox List have horizontal scrollbars because mose package names and type names don't fit in the default size. It would be nice to be able to size this dialog bigger, and have it have a wider default size (I assume it is sized for 640x480? but is could be wider).
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarPackageWizardPage.java
* accessor for subclasses.
	 *
	 * @return an iterator over the collection of elements currently selected for export
	 */
	protected Iterator getSelectedResourcesIterator() {
		return fInputGroup.getAllCheckedListItems();
	}
	/**
	 * Persists resource specification control setting that are to be restored
	 * in the next instance of this page. Subclasses wishing to persist
	 * settings for their controls should extend the hook method 
	 * <code>internalSaveWidgetValues</code>.
	 */
	public final void saveWidgetValues() {
		
		IDialogSettings settings= getDialogSettings();
		if (settings != null) {
			String[] directoryNames= settings.getArray(STORE_DESTINATION_NAMES);
			if (directoryNames == null)
				directoryNames= new String[0];
			directoryNames= addToHistory(directoryNames, getDestinationValue());
			settings.put(STORE_DESTINATION_NAMES, directoryNames);
			settings.put(STORE_EXPORT_CLASS_FILES, fJarPackage.areClassFilesExported());
			settings.put(STORE_EXPORT_JAVA_FILES, fJarPackage.areJavaFilesExported());
			
			settings.put(STORE_COMPRESS, fJarPackage.isCompressed());
			settings.put(STORE_OVERWRITE, fJarPackage.allowOverwrite());
		}
		
		internalSaveWidgetValues();