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
{
					"==", Messages.getString( "ExpressionProvider.Operator.Equals" ) 
			},
			{
					"<", Messages.getString( "ExpressionProvider.Operator.Less" ) 
			},
			{
					"<=",
					Messages.getString( "ExpressionProvider.Operator.LessEqual" )  
			},
			{
					"!=",
					Messages.getString( "ExpressionProvider.Operator.NotEqual" )  
			},
			{
					">", Messages.getString( "ExpressionProvider.Operator.Greater" ) 
			},
			{
					">=",
					Messages.getString( "ExpressionProvider.Operator.GreaterEquals" ) 
			}
	};
	
	private static final String[][] OPERATORS_COMPUTATIONAL = new String[][]{
			{
					"+", Messages.getString( "ExpressionProvider.Operator.Add" ) 
			},
			{
					"-", Messages.getString( "ExpressionProvider.Operator.Sub" ) 
			},