Bug 147253 [Context Sensitive] Preferences->Report Design->Data Set Editor, context help button doesn't work when JDBC Data Set get focus
Description: In Preferences->Report Design->Data Set Editor, context help button doesn't work when JDBC Data Set get focus. Steps to reproduce: 1.Select Windows menu 2.Select Preference 3.Select Data set editor 4.Select JDBC Data Set, make sure the focus is on it (Notes: when click on JDBC Data Set the first time, focus isn't on it, you must select it again to set focus on it) 5.Click help button Expected result: Context help shows up Actual resutl: Help button doesn't work, and F1 doesn't work too.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/preference/DateSetPreferencePage.java
data.horizontalSpan = 2;
		data.verticalSpan = 5;
		
		GridLayout layout = new GridLayout();
		mainComposite.setLayout( layout );
		Group sqlDataSetGroup = new Group( mainComposite, SWT.NONE );
		sqlDataSetGroup.setLayout( layout );
		sqlDataSetGroup.setText( JdbcPlugin.getResourceString( "designer.preview.preference.resultset.sqldatasetpage.group.title" ) );
		sqlDataSetGroup.setLayoutData( data );
		sqlDataSetGroup.setEnabled( true );
		
		maxDisplaySchemaEditor = new IntegerFieldEditor( USER_MAX_NUM_OF_SCHEMA, "", sqlDataSetGroup ); 
		
		Label lab = maxDisplaySchemaEditor.getLabelControl( sqlDataSetGroup );
        lab.setText(JdbcPlugin.getResourceString("designer.preview.preference.resultset.maxNoOfSchema.description" ));
		
		maxDisplaySchemaEditor.setPage(this);
		maxDisplaySchemaEditor.setTextLimit( Integer.toString( MAX_MAX_ROW ).length( ) );
		
		maxDisplaySchemaEditor.setValidateStrategy( StringFieldEditor.VALIDATE_ON_KEY_STROKE );
		maxDisplaySchemaEditor.setValidRange(0, MAX_MAX_ROW);
		
		maxDisplaySchemaEditor.setPropertyChangeListener(new IPropertyChangeListener() {
            public void propertyChange(PropertyChangeEvent event) {
                if (event.getProperty().equals(FieldEditor.IS_VALID))
                        setValid(maxDisplaySchemaEditor.isValid());
            }
        });
		
		maxDisplaySchemaEditor.setErrorMessage( JdbcPlugin.getFormattedString( "designer.preview.preference.resultset.maxNoOfSchema.errormessage",