Bug 130182 [CommonNavigator][Help] missing help in Customize View dialog
open the Filters... dialog and click the help button, note no help appears.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/filters/CommonFilterSelectionDialog.java
extensionsTabItem.setImage(NavigatorPlugin.getDefault().getImage(imageKey));
 		return extensionsTabItem;
	}
	private void createDescriptionText(Composite composite) {
		descriptionText = new Label(composite, SWT.WRAP);
		descriptionText.setFont(composite.getFont());
		descriptionText.setBackground(composite.getBackground());
		GridData descriptionTextGridData = new GridData(GridData.FILL, GridData.BEGINNING, true, false);
		descriptionTextGridData.heightHint = convertHeightInCharsToPixels(3);
		descriptionText.setLayoutData(descriptionTextGridData);
	}
	private ISelectionChangedListener getSelectionListener() {
		if (updateDescriptionSelectionListener == null) {
			updateDescriptionSelectionListener = new FilterDialogSelectionListener(
					descriptionText);
		}
		return updateDescriptionSelectionListener;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.dialogs.Dialog#okPressed()
	 */
	protected void okPressed() {
		if (contentExtensionsTab != null) {
			List checkedExtensions = new ArrayList();
			TableItem[] tableItems = contentExtensionsTab.getTable().getItems();
			INavigatorContentDescriptor descriptor;
			for (int i = 0; i < tableItems.length; i++) {
				descriptor = (INavigatorContentDescriptor) tableItems[i]