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
implements IWorkbenchPreferencePage
{
	private IntegerFieldEditor maxDisplaySchemaEditor;
	private IntegerFieldEditor maxDisplayTableEditor;
	
	
	public static final int DEFAULT_MAX_NUM_OF_SCHEMA = 20;
	
	
	public static final int DEFAULT_MAX_NUM_OF_TABLE_EACH_SCHEMA = 100;
	
	private static final int MAX_MAX_ROW = Integer.MAX_VALUE;
	
	
	public static final String USER_MAXROW = "user_maxrow"; 
	public static final String USER_MAX_NUM_OF_SCHEMA = "user_max_num_of_schema";
	public static final String USER_MAX_NUM_OF_TABLE_EACH_SCHEMA="user_max_num_of_table_each_schema";
	/*
	 * @see org.eclipse.jface.preference.PreferencePage#createContents(org.eclipse.swt.widgets.Composite)
	 */
	protected Control createContents( Composite parent )
	{
		Composite mainComposite = new Composite( parent, SWT.NONE );
		GridData data = new GridData( GridData.FILL_HORIZONTAL);