Right, it is not normal to modify the ui_file. Never ever do that.

If the action was shown in the first case, check whether connect returned true. It returns false if the connect failed.

See whether you got any runtime warning about a failed connection.

Ah: There is a nice feature in vBulletiin: Use [ code ] tags for snippets like this:

Qt Code: 
  1. QWidget* w = new QWidget(this)
To copy to clipboard, switch view to plain text mode 

See: We even got syntax-highlighting and linking to the Qt-docs working !!!