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
maxDisplayTableEditor.setErrorMessage( JdbcPlugin.getFormattedString( "designer.preview.preference.resultset.maxNoOfTable.errormessage",
				new Object[]{new Integer( MAX_MAX_ROW )	} ) );
		
		String defaultMaxTable = JdbcPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( USER_MAX_NUM_OF_TABLE_EACH_SCHEMA );
		if ( defaultMaxTable == null || defaultMaxTable.trim( ).length( ) <= 0 )
		{
			defaultMaxTable = String.valueOf( DEFAULT_MAX_NUM_OF_TABLE_EACH_SCHEMA );
		}
		maxDisplayTableEditor.setStringValue( defaultMaxTable );
		
		Utility.setSystemHelp( mainComposite,
				IHelpConstants.CONEXT_ID_PREFERENCE_DATASET_JDBC );
		
		return mainComposite;
	}
	/*
	 * @see org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench)
	 */
	public void init( IWorkbench workbench )
	{
		
	}
	/*
	 * @see org.eclipse.jface.preference.PreferencePage#performDefaults()
	 */
	protected void performDefaults( )
	{
		maxDisplaySchemaEditor.setStringValue( String.valueOf( DEFAULT_MAX_NUM_OF_SCHEMA ));