bool Validate()
        {
            if (notebook.Page == 2)
            {
                if (fileChooser.Filename == null || fileChooser.Filename.Length == 0 || !File.Exists(fileChooser.Filename))
                {
                    return(true);
                }

                importedImageFile = project.ImportFile(fileChooser.Filename);
                if (importedImageFile != null)
                {
                    importedImageFile = WidgetUtils.AbsoluteToRelativePath(project.ImagesRootPath, importedImageFile);
                }
                return(importedImageFile != null);
            }
            return(true);
        }