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One example is shown below from the Device Driver Installation dialog but there a many similar cases. It is very difficult to obtain a decent overview having such a small window for the tree display.
I suggest as a general style guide to always enable the resize option in a dialog box whenever the layout requires a scroll box.
I have a hard time to see what could be reasons not to do so.
I forgot to mention that I refer to the system dialog boxes such as the installers, MAX or similar. What the user does in his or her application is of course up to them - never the less I think the style is good in any case.