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
* 
	 * @param path
	 *            The path under which the new node is to be added.
	 * @param node
	 *            The node to be added.
	 */
	public final void addNodeTo( String path, PropertyNode node )
	{
		node.setContainer( this );
		if ( path == null || path.trim( ).equals( "/" ) ) 
		{
			rootNode.add( node );
		}
		else
		{
			PropertyNode parentNode = getNode( path );
			if ( parentNode != null )
			{
				parentNode.add( node );
			}
		}
	}
	/**
	 * This is a convenience method that can be used to add the PropertyPage to
	 * the dialog. In turn it creates a PropertyNode object and calls the
	 * {@link #addNodeTo(String, PropertyNode) addNodeTo}method.
	 * 
	 * @param path
	 *            The path under which the new page is to be added.
	 * @param nodeId