I do not have XDPX (version 8, I assume) at hand, but in XDPX9 it works perfectly. I mean, when I unlock the aspect ratio (by simply un-checking the lock icon), text can be stretched using resize controls. Other method, not involving constant aspect ratio -lock and -unlock, is to press Ctrl+G (group) on the text object alone, resize vertically, and press Ctrl+U (ungroup).
One more thing - do you have a "text line" object, or rather a "text area" object? Because the latter does not stretch letters when resized - unless, of course, you use the grouping "hack".
Bookmarks