Once you find what you need, simply download the BMML file and open it in Mockups for Desktop.

Then you can simply “Select All”, Copy, and Paste it into your mockup.

If you are using a plugin version of Mockups (or the web demo version) you can import the BMML via the Import feature instead (Importing won’t erase your current mockup, it will simply add to it).

We have plans to integrate Mockups To Go more deeply into the application, so that you'll be able to search and add controls directly from the UI Library. Stay tuned!