Bug 121273 Script modification of style properties does not work for data item
Create a report with a lable and a data item. In the onCreate method for both items, put this.style.color="red" The label item works, but the data item does not.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/DataEngineImpl.java
* @see org.eclipse.birt.data.engine.api.DataEngine#clearCache(org.eclipse.birt.data.engine.api.IBaseDataSourceDesign,
	 *      org.eclipse.birt.data.engine.api.IBaseDataSetDesign)
	 */
	public void clearCache( IBaseDataSourceDesign dataSource,
			IBaseDataSetDesign dataSet ) throws BirtException
	{
		if ( dataSource == null || dataSet == null )
			return;
		DataSetCacheManager.getInstance( ).clearCache( dataSource, dataSet );
	}
	
	/**
	 * Returns the runtime defn of a data source. If data source is not found,
	 * returns null.
	 */
	DataSourceRuntime getDataSourceRuntime( String name )
	{
		return (DataSourceRuntime) dataSources.get( name );
	}
	/**
	 * Returns the design of a data set. If data set is not found, returns null.
	 */
	IBaseDataSetDesign getDataSetDesign( String name )
	{
		return (IBaseDataSetDesign) dataSetDesigns.get( name );
	}
	/**
	 * Verifies the elements of a report query spec
	 * and provides a hint to the query to prepare and optimize 
	 * an execution plan.