Now we add the widget for entering the filename. The one we will use is the one provided by the Gnome palette.
We could use the text entry field of the GTK+ Basic palette and add a Browse button ourselves, but the Gnome palette Gnome File Entry widget does it all for us, and more. Click on this widget in the palette then click in the top right cell of your canvas. The browse button might look a bit strange (stretched out) but don't worry, it will sort itself out!