How to include existing files to project?

[Asperamanca]

In Qt Creator (1.3.0), how do I add an already existing UI file to a project? If I Open it, the file opens, but is not added to the project.

[Asperamanca]

Found it.
In the Project tree, right-click to get the menu entry "Add existing Files..."
A bit obscure, but works for me.

[ktk]

Found it.
In the Project tree, right-click to get the menu entry "Add existing Files..."
A bit obscure, but works for me.

You can edit the .pro file, too.