Displays a list of all of the applets registered on your machine and available to add to your project's Toolbox. The applets that the development environment determines are in the Toolbox and in the registry display a check mark to the left of their names.
You can:
Displays the available applets: their names and the packeage to which it belongs.
Displays the ? Shannon, what would you call what is shown here?.
Restores the Toolbox to its default state and refreshes the currently open tab. The default applets appear with a check in the check box to the left of them.