Bug 40300 Compiler pref page does not disable unavailable preferences [build path]
I20030716 + plug-in export If I set a parent preference to ignore I'd expect that sub-properties get disabled.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
*/
	protected Control createContents(Composite parent) {
		fPixelConverter= new PixelConverter(parent);
		setShell(parent.getShell());
		
		TabFolder folder= new TabFolder(parent, SWT.NONE);
		folder.setLayout(new TabFolderLayout());	
		folder.setLayoutData(new GridData(GridData.FILL_BOTH));
		
		Composite commonComposite= createStyleTabContent(folder);
		Composite unusedComposite= createUnusedCodeTabContent(folder);
		Composite advancedComposite= createAdvancedTabContent(folder);
		Composite complianceComposite= createComplianceTabContent(folder);
		Composite othersComposite= createBuildPathTabContent(folder);
		TabItem item= new TabItem(folder, SWT.NONE);
		item.setText(PreferencesMessages.getString("CompilerConfigurationBlock.common.tabtitle")); 
		item.setControl(commonComposite);
		item= new TabItem(folder, SWT.NONE);
		item.setText(PreferencesMessages.getString("CompilerConfigurationBlock.advanced.tabtitle")); 
		item.setControl(advancedComposite);
		item= new TabItem(folder, SWT.NONE);
		item.setText(PreferencesMessages.getString("CompilerConfigurationBlock.unused.tabtitle")); 
		item.setControl(unusedComposite);
	
		item= new TabItem(folder, SWT.NONE);
		item.setText(PreferencesMessages.getString("CompilerConfigurationBlock.compliance.tabtitle")); 
		item.setControl(complianceComposite);
		
		item= new TabItem(folder, SWT.NONE);
		item.setText(PreferencesMessages.getString("CompilerConfigurationBlock.others.tabtitle"));