Since Sparta is no longer functional/maintained, we decided to backport CT's excellent form designer(r.62735). You can test it with Lazarus trunk:
1. Svn update/git pull
2. Recompile package ideintf($(Lazarus)/components/ideintf/ideintf.lpk)
3. Rebuild IDE
4. Go to Tools->Options->Environment->Embedded designer and check "Enable embedded desinger"
Important:
Please avoid any drama in this thread, if you have issues with CT, take it somewhere else. This thread is about the designer and nothing else.