Open the Jazz Administration perspective in eclipse
In the Team Artifacts view, expand My Repository Workspaces, and then select your workspace
Right clicked on the component that contains your project
Select Load... from the right click menu
Select the subfolder(s) of the component that you want to load. This will normally be a single folder that maps to a WPF project.
In the Advanced Options section, chose to "Load the selected folders but do not create Eclipse projects"
Click Finish on the Load... wizard
This should load the selected folders from RTC into your workspace
Create a new WPF project with the same name as the folder from RTC.
This will map the new WPF project to the RTC folder.
Right click the project and select Team->Share Project...
This should populate the next screen with all of the repository info for the existing source already checked out there.
Right click the project and select Team->Show Pending Changes
It should show you the list of files in the project that need to be checked into RTC