You can restore the Toolbox to its default state after making
changes. Doing so has no effect on control instances that have already been placed
on a form.
Before restoring the Toolbox, back up the project's toolbox.xml
file if you want to save the customized configuration.
To restore the
Toolbox to its default state, right-click in the
Toolbox and select
Reset
Toolbox from the context menu.
Note: The
Reset Toolbox command is
disabled if the project includes references to any out-of-date assembly
versions. This helps prevent the possibility of a version conflict between the
controls available in the Toolbox and the controls in use
in the project.