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 ( decPlaces > 0 && decPlaces < 10 )
		{
			decStr = defaultDecs.substring( 0, decPlaces );
		}
		else if ( decPlaces >= 10 )
		{
			if ( decPlaces > 100 )
			{
				decPlaces = 100;
			}
			int quotient = decPlaces / 10;
			int remainder = decPlaces % 10;
			StringBuffer s = new StringBuffer( 100 );
			for ( int i = 0; i < quotient; i++ )
			{
				s.append( defaultDecs );
			}
			s.append( defaultDecs.substring( 0, remainder ) );
			decStr = s.toString( );
		}
		return decStr;
	}
	/**
	 * @param transferSource
	 * @return true if parameter is parameter group.
	 */
	public static boolean isParameterGroup( Object transferSource )
	{
		return ( transferSource instanceof IDesignElement && ( (IDesignElement) transferSource )
				.getDefn( ).getName( ).equals(