I recently created my first package, and it included an action to install a dashboard section. Worked according to plan. However, I then created a second package (to add a new file) that was the second version of the first package. When I installed the second package, it created a duplicate of the dashboard item. I'd like the dashboard item to exist only once, whether somebody is upgrading or installing the package for the first time.

I followed the instructions here to have the dashboard section be installed: http://our.umbraco.org/wiki/reference/packaging/package-actions/add-dashboard-section

This is basically what the action in my package.xml file looks like:

<Actions>
  <Action runat="install" alias="addDashboardSection" dashboardAlias="MyCustomDashboardSection">
    <section>
      <areas>
        <area>content</area>
      </areas>
      <tab caption="My Tab">
        <access>
          <grant>administrator</grant>
        </access>
        <control>/Path/To/UserControl.ascx</control>
      </tab>
    </section>
  </Action>
</Actions>