This is a description of the control's official website
"Hello a package for A docked form editor can found IN:COMPONENTS/SPARTA/DOCKEDFORMEDITOR/SPARTA_DOCKEDFORMEDITOR.LPK
It is first cleaned from component palette code and renamed in Freesparta Branch, then committed to trunk. Please test everybody! Things to remember:-If you have the same from Freesparta branch installed, you must uninstall it first. -The package requires FPC 3.0 (which now means 3.0rc2). -A docked form editor makes most sense with anchordocking, but it can be used also without it. Maciej'll tell more. Regards, Juha "
A similar editing effect was achieved with the form interface after Delphi 8. The floating form designer is pinned to the edit page.
Of course, this effect is also loaded anchordockingdsgn.lpk of the comprehensive effect!
Lazarus 1.6 Adds a new form editor--SPARTA_DOCKEDFORMEDITOR.IPK