Copy to right in compare

Hello all,

I am new to TFS and I cant seem to figure out how to do something I thought would be relatively easy  I am using VS 2013 Web

1) If i have a text file text1.txt  and add the text "Line 1" and check it in so this is now Changeset 1

2) I modify the file and add change the text to "Line A" and check in - this is now Changeset 2;

I now determine I actually want the file to read Line 1 as in the first changeset.  I run a compare from my current project which is changeset 2 (latest version) to compare it with the contents of changeset1 and I see the differences nicely in  a side by side comparison.  

Question: Why cant I do a copy to right from the left side (changeset1) to the right side which should be my local workspace?  Am I missing something simple?

Thanks so muck

MJH