Bug 154832 Wrong node is added to Report Parameters for cascading parameter in Palette view
Description: Wrong node is added to Report Parameters for cascading parameter in Palette view. Steps to reproduce: 1. New a report, add a cascading parameter 2. Switch to Script tab in Editor view, and then switch to Palette view 3. Expand Report Parameters node Expected result: A cascading parameter group is added to Report Parameters node Actual result: Expect a cascading parameter group is added to Report Parameters node, the children of the cascading parameter group are added as scalar parameters
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/ExpressionTreeSupport.java
public static final String TREE_NAME_BIRT_OBJECTS = "Birt Objects"; 
	public static final String TREE_NAME_DATASETS = "DataSets"; 
	public static final String TREE_NAME_PARAMETERS = "Parameters"; 
	public static final String TREE_NAME_CONTEXT = "Context"; 
	private Object currentEditObject;
	private String currentMethodName;
	private TreeItem contextItem;
	/**
	 * Creates all expression trees in default order
	 * 
	 * @param dataSetList
	 *            list for DataSet tree
	 */
	public void createDefaultExpressionTree( List dataSetList )
	{
		createFilteredExpressionTree( dataSetList, null );
	}
	/**
	 * Creates selected expression trees with given filter list.
	 * 
	 * @param dataSetList
	 *            list for DataSet tree
	 * @param filterList
	 *            list of filters
	 */
	public void createFilteredExpressionTree( List dataSetList, List filterList )
	{
		if ( filter( TREE_NAME_CONTEXT, filterList ) )
		{
			createContextCatagory( );