Bug 190727 [regression]Default value issue when switch report parameter from textbox to listbox.[0705]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
private void refreshValueTable( )
	{
		if ( valueTable != null && !valueTable.getTable( ).isDisposed( ) )
		{
			valueTable.refresh( );
			updateTableButtons( );
		}
	}
	private boolean getProperty( String key )
	{
		return ( (Boolean) dirtyProperties.get( key ) ).booleanValue( );
	}
	private String format( String string )
	{
		if ( canBeNull( ) && string == null )
		{
			return LABEL_NULL;
		}
		if ( StringUtil.isBlank( string ) || formatCategroy == null )
		{
			return string;
		}
		try
		{
			String pattern = formatPattern;
			if ( formatPattern == null )
			{
				if ( isCustom( ) )
				{
					return string;