Bug 191404 Connection is still successful after delete drivers[0703]
Description: Create a Sqlserver datasource and dataset, then delete the jtds driver. Click "Test Connection" is still successful, and the dataset still works. Build Version:2.2.0.v20070607-0630 Steps to reproduce: 1. Add a jtds driver, and create a Sqlserver connection and dataset. 2. Go to "Manage JDBC Drivers" dialog, and delete the driver. 3. Click "Test Connection", the connection is successful. 4. Click "Preview Results" in "Edit Data Set" dialog, it works. Expected Result: Delete driver will lose the connection.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/dialogs/JdbcDriverManagerDialog.java
* a flag indicate whether the jar page has been changed
	 */
	private boolean jarChanged = false;
	private static boolean driverChanged = false;
	
	/**
	 * list of jars to be copied and deleted when okPressed
	 * will be reset everytime after pressing ok button
	 */
	private Hashtable jarsToBeCopied,jarsToBeDeleted;
	
	/**
	 * list of jars to be copied or deleted at runtime
	 * will be reset everytime after hitting driver tab
	 */
	private Hashtable jarsToBeCopiedRuntime, jarsToBeDeletedRuntime;
	
	private int btnWidth = 90;
	
	private Comparator collator = Collator.getInstance( );
	
	/**
	 * The constructor.
	 * 
	 * @param parentShell
	 */
	public JdbcDriverManagerDialog( Shell parentShell )
	{
		super( parentShell );
		setShellStyle( SWT.CLOSE