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
* Try to split the given value to String[2]. The result format is as
	 * follows: [number][other]. If either part can not be determined, it will
	 * leave null.
	 * 
	 * @param value
	 *            given string value
	 * @return [number][other]
	 */
	public static String[] splitString( String value )
	{
		String[] spt = new String[2];
		if ( value != null )
		{
			for ( int i = value.length( ); i > 0; i-- )
			{
				if ( isValidNumber( value.substring( 0, i ) ) )
				{
					spt[0] = value.substring( 0, i );
					spt[1] = value.substring( i, value.length( ) );
					break;
				}
			}
			if ( spt[0] == null && spt[1] == null )
			{
				spt[1] = value;
			}
		}
		return spt;
	}
	/**