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
}
	/**
	 * Returns all font names for current system. NOTES: Java 1.4 only support
	 * true type fonts.
	 * 
	 * @param comparator
	 *            Sort comparator.
	 * @return font names.
	 */
	public static String[] getSystemFontNames( Comparator comparator )
	{
		GraphicsEnvironment ge = GraphicsEnvironment
				.getLocalGraphicsEnvironment( );
		String[] fontNames = ge.getAvailableFontFamilyNames( );
		if ( comparator != null )
		{
			Arrays.sort( fontNames, comparator );
		}
		return fontNames;
	}
	/**
	 * Gets the tool used to process multil-selection.
	 * 
	 * @param modelList
	 *            DE model list.
	 * @return The tool used to process multil-selection.
	 */
	public static GroupElementHandle getMultiSelectionHandle( List modelList )
	{
		ModuleHandle designHandle = SessionHandleAdapter.getInstance( )