一下是该控件官网的介绍
“Hello A package for a docked form editor can be found in : components/sparta/dockedformeditor/sparta_dockedformeditor.lpk
It was 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 old package 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 will tell more. Regards, Juha”
实现了同delphi 8 之后窗体界面类似的编辑效果。将浮动的窗体设计器固定到了编辑页里。
当然，这个效果也是装载了AnchorDockingDsgn.lpk的综合效果！
Lazarus 1.6 增加了新的窗体编辑器——Sparta_DockedFormEditor.ipk
原文：http://www.cnblogs.com/hieroly/p/5218886.html