Bug 135465 [smoke]An error occurred when new a casading Parameter
Description: An error occurred when new a casading Parameter Step to reproduce: 1.new a sample db data source and data set 2.New a cascading parameter group, named "gp1", 3.select the data set, then create two cascading parameters, one is row["customernumber"], named p1; the other is row["customername"] Actual result; error message occurred repeatly
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
				if ( !found )
				{
					try
					{
						handle.setValueExpr( null );
					}
					catch ( SemanticException e )
					{
						ExceptionHandler.handle( e );
					}
				}
			}
			if ( newParameter == null )
			{
				newParameter = DesignElementFactory.getInstance( )
						.newScalarParameter( null ); 
				try
				{
					newParameter.setControlType( DesignChoiceConstants.PARAM_CONTROL_LIST_BOX );
					newParameter.setValueType( DesignChoiceConstants.PARAM_VALUE_TYPE_DYNAMIC );
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			elementsList.add( newParameter );
			return elementsList.toArray( );
		}