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
{
			return (String) propertiesMap.get( key );
		}
		return null;
	}
	/**
	 * Transform other units to pixel.
	 * 
	 * @param handle
	 *            DimensionHandle of model to keep the measure and units.
	 * @return The pixel value.
	 */
	public static double convertoToPixel( Object handle )
	{
		return convertToPixel( handle, 0 );
	}
	/**
	 * Transform other units to pixel.
	 * 
	 * @param object
	 *            model to keep the measure and units.
	 * @param fontSize
	 *            the parent font size.
	 * @return The pixel value.
	 */
	public static double convertToPixel( Object object, int fontSize )
	{
		double px = 0;
		double measure = 0;
		String units = "";