Bug 177091 Can't access stored procedure defined in Oracle Package
1.setup an oracle connection 2.try to call a stored procedure defined in package
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
RemoveAllAvailableDbObjects( );
		setRootElement( );
		setRefreshInfo( );
		if ( isSchemaSupported )
		{
			populateSchemaList( );
		}
		else
		{
			populateTableList( );
		}
		addFetchDbObjectListener( );
		
		if ( rootNode != null )
		{
			selectNode( rootNode );
		}
	}
	/**
	 * 
	 * @return
	 */
	private DataSetDesign getDataSetDesign( )
	{
		if ( dataSetDesign == null )
			dataSetDesign = this.getInitializationDesign( );
		return dataSetDesign;
	}
	/**
	 * populate shema list if the schema is supported