Bug 199021 Error message pops up several times when click an invalid dataset
Description: There is a sqlserver datasource and dataset, remove the jtds driver to let the dataset invalid. Double click on the dataset, the error message will pop up serveral times. Build version:2.2.0.v20070807-0630 Steps to reproduce: 1. Create a sqlserver datasource and dataset. 2. Remove the jtds driver, and the dataset will be invalid. 3. Double click on the dataset. Expect result: Error message pops up once to indicate the problem. Actual result: Error message pops up serveral times.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
}
				} );
		attachMenus( viewer );
		GridData data = new GridData( GridData.FILL_BOTH );
		viewer.getControl( ).setLayoutData( data );
		
		addDropSupportToViewer( );
		
		viewer.getTextWidget( ).addKeyListener( new KeyListener( ) {
			public void keyPressed( KeyEvent e )
			{
				if ( isUndoKeyPress( e ) )
				{
					viewer.doOperation( ITextOperationTarget.UNDO );
				}
				else if ( isRedoKeyPress( e ) )
				{
					viewer.doOperation( ITextOperationTarget.REDO );
				}
			}
			private boolean isUndoKeyPress( KeyEvent e )
			{
				
				return ( ( e.stateMask & SWT.CONTROL ) > 0 )
						&& ( ( e.keyCode == 'z' ) || ( e.keyCode == 'Z' ) );
			}
			private boolean isRedoKeyPress( KeyEvent e )
			{
				
				return ( ( e.stateMask & SWT.CONTROL ) > 0 )