Bug 145991 [Regression]Invalid data set should not be allowed to drag or "Insert in layout"
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DataSetHandle.java
/**
	 * Returns the code of the afterClose method. This is the script called just
	 * after closing this data set.
	 * 
	 * @return the code of the method
	 */
	public String getAfterClose( )
	{
		return getStringProperty( SimpleDataSet.AFTER_CLOSE_METHOD );
	}
	/**
	 * Sets the code for the afterClose method. This is the script called just
	 * after closing this data set.
	 * 
	 * @param code
	 *            the code for the method
	 * @throws SemanticException
	 *             If the method is locked.
	 */
	public void setAfterClose( String code ) throws SemanticException
	{
		setProperty( SimpleDataSet.AFTER_CLOSE_METHOD, code );
	}
	/**
	 * Returns the code of the onFetch method. This is the script called just
	 * after fetching each row.
	 * 
	 * @return the code of the method
	 */
	public String getOnFetch( )