Bug 134988 [regression]Available items in Query didn't change when change data source in Edit Data Set Dialog.
Description: Available items in Query didn't change when change data source in Edit Data Set Dialog. Steps to reproduce: 1. New two different data sources. 2. New a dataset, change data source, view Available Items in Query pane. Expected result: Available Items in Query pane changed according to new Data source. Actual result: Available Items in Query pane kept unchanged.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/property/AbstractPropertyDialog.java
implements
			IPropertyPageContainer
{
	private transient Object modelObject = null;
	protected transient PropertyNode rootNode = null;
	private transient StackLayout propertyPaneLayout = null;
	private transient Composite propertyPane = null;
	private transient PropertyNode currentNode = null;
	private transient boolean processSelection = true;
	private transient Label titleImage = null;
	protected TreeViewer viewer = null;
	private DialogMessageArea messageArea = null;
	private String nodeId;
	
	protected boolean showPage = false;
	/**
	 * The only constructor for this dialog. It takes the parentShell and the
	 * model object as parameters.
	 *