Can I customize a panel in a dashboard by code?

Hi,

Can I customize a panel in a dashboard using code. Is there some sort of API for that
For eg: I would like to show the CSV download option as an icon in the side of the dashboard.Is this possible?

There is no API for customizing buttons and styles. I suppose you could make your own custom panel plugin with just the CSV download button.

Thank you.
What we need is a CSV download button on every panel. It is already there. But we need to make it visible to the users.
I can develop the plugins or customize them. Can you please guide me how to get started with this.