Bug 120503 Cascading Parameter can not drop into layout
Details: Cascading Parameter can not drop into layout Step: 1.Open a report design and Create a Sample Data Source and data set by "select * from CLASSICMODELS.CUSTOMERS" 2.New a cascading parameter and create CUSTOMERSNUMBER and CUSTOMERSNAME in parameter named number and name. Press OK 3.Drop parameter name into layout. Actual results: The parameter in Cascading Parameter Group can not drop to layout
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
if ( object instanceof DimensionValue )
		{
			DimensionValue dimension = (DimensionValue) object;
			measure = dimension.getMeasure( );
			units = dimension.getUnits( );
		}
		else if ( object instanceof DimensionHandle )
		{
			DimensionHandle dimension = (DimensionHandle) object;
			measure = dimension.getMeasure( );
			units = dimension.getUnits( );
		}
		if ( DesignChoiceConstants.UNITS_PX.equals( units ) )
		{
			return measure;
		}
		
		if ( "".equalsIgnoreCase( units ) ) 
		{
			px = measure;
		}
		if ( fontSize == 0 )
		{
			Font defaultFont = JFaceResources.getDefaultFont( );
			FontData[] fontData = defaultFont.getFontData( );
			fontSize = fontData[0].getHeight( );
		}
		if ( DesignChoiceConstants.UNITS_EM.equals( units ) )
		{
			px = DimensionUtil.convertTo( measure * fontSize,