How to dim / fade all other windows of an application in Delphi 2009.

Form has an AlphaBlend property, but it controls only transparency level. But it would be nice if we can have something like this (Concentrated window) . Even stackoverflow.com does that, when we try to insert a link/ image etc in the post.

How can we achieve this in a delphi application?

delphi delphi-2009
Edit
Report