Bug 67890 [PropertiesView] Exception when entries added to properties view
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetEntry.java
*/
    protected Object getEditValue(int index) {
        Object value = values[index];
        IPropertySource source = getPropertySource(value);
        if (source != null) {
            value = source.getEditableValue();
        }
        return value;
    }
    /* (non-Javadoc)
     * Method declared on IPropertySheetEntry.
     */
    public String getErrorText() {
        return errorText;
    }
    /* (non-Javadoc)
     * Method declared on IPropertySheetEntry.
     */
    public String getFilters()[] {
        return descriptor.getFilterFlags();
    }
    /* (non-Javadoc)
     * Method declared on IPropertySheetEntry.
     */
    public Object getHelpContextIds() {
        return descriptor.getHelpContextIds();
    }
    /* (non-Javadoc)
     * Method declared on IPropertySheetEntry.
     */