Custom Extension SidePanel Toolbar/Upload/Filter

I’m new to developing extensions with JupyterLab, and am currently creating a custom extension that fetches data and renders a file directory similar to how JupyterLab does in the Side Panel, using FileBrowser. I can’t seem to get the toolbar/fileupload/filter by name? How do i do this? Thanks in advance.

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I can’t seem to get the toolbar/fileupload/filter by name

By get do you mean that it is not showing up? Can you share your extension or a set of relevant code snippets?

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Yes not showing up. I am unable to share the extension but have done something similar to this IBM example GitHub - IBM/jupyterlab-s3-browser: A JupyterLab extension for browsing S3-compatible object storage. However, am not entirely sure how the toolbar with filter is rendering here?

lm-Widget jp-Toolbar jp-SidePanel-toolbar jp-FileBrowser-toolbar, this div doesn’t show along with the launcher, new directory, uploader, refresh and file searcher. Would really appreciate some help as have been stuck on this for a week. Thank you