G'day Audar,

Welcome to the monastery.

When asking questions about Tk, please provide a short working example script that we can run. This allows us to reproduce your problem rather than guessing what all the missing code might be. Furthermore, excluding non-essential elements (such as relief, borderwidth, colours, etc.) removes a lot of noise in the code and helps us get to the heart of the problem. Also, a simple piece of ASCII-art, demonstrating the layout you're trying to achieve, is vastly superior to a textual description of what you want: "a picture paints a thousand words".

I added code to what you posted to get the GUI running. I couldn't reproduce what you described. This is the problem I already mentioned: "guessing what all the missing code might be". I can supply a few suggestions as to where you might be going wrong.

Using '-fill => 'both', -expand => 1' will tend to force elements to the centre: this may be one of your issues. See Tk::pack paying particular attention to the sections: "DESCRIPTION", "THE PACKER ALGORITHM" and 'EXPANSION". Hint: it's often useful to temporarily set different background colours (-bg option) for every widget to see exactly what space they are taking up.

The '-anchor' option is a standard widget option as well as a pack() option. I suspect you want the former: check Tk::options and Tk::pack.

Tk::Frame is not intended to be an interactive widget. From its DESCRIPTION:

"A frame is a simple widget. Its primary purpose is to act as a spacer or container for complex window layouts. The only features of a frame are its background color and an optional 3-D border to make the frame appear raised or sunken."

Tk::Pane is probably what you want for the "Scrolled('Frame' ..." code. From its DESCRIPTION:

"Tk::Pane provides a scrollable frame widget. Once created it can be treated as a frame, except it is scrollable."

While unrelated to your current problem (as far as I can tell), you really should avoid Indirect Object Syntax. Its use is strongly discouraged: see perlobj: Invoking Class Methods.