Alternative Words for Show, Hide, Done, or Collapse?

I am working on a computer application and from a design aspect, I would like my application to be as intuitive as possible. I currently have a panel that is displayed via a menu strip and that panel has a button that says "Done" used to collapse the panel. The panel is used for loading data and thus the way to display it is:

  • File->Load->Data

Then once you've completed loading your data, the idea is to click "Done" to collapse the panel and continue your work in the main content area. This gets rid of the need for an extra form with such simple work occurring inside the panel.

So far, I have a split panel control where panel1 is the main content area, and panel2 is the data area. At the bottom of panel2 is a button (as described above). I'm afraid that this isn't as intuitive as I think it is, and that I should either chose a different word, or utilize a different layout to accomplish this task.

The flow of this is as follows:

  • The user wants to load data.
    • File->Load->Data
  • Data loader panel is displayed.
  • User selects the data to load.
  • Data is loaded.
  • User clicks "Done" to collapse the panel.

An alternative is to collapse the panel when it loses focus, or once data loading is completed.

What would be the proper word used to inform a user that the button they are about to click will collapse the panel (alternatives to show, hide, done, close, or collapse are preferred).

Example

@Nicolas Hung asked for a screenshot of the GUI for clarification purposes. I am unable to provide a true screenshot; however, I have crafted an example that I can use to help explain.

GUI Example

The dark grey area is the data panel; once the user clicks done, the panel then collapses to the right, expanding the main area (black area).

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