Consider a [resentation where many objects are selected for custom animation. In
this case, the "custom animation" pane shows a long list, which goes beyond ins
small window.

When we select an object in thew slide, its entry is highlighted in the custom
animation winddow. But in many cases, this entry is above/below the visible part
of the list, so we can't see it. Worse, we don't know whether it is above or
below. So we have to try and scroll up and down to locate it.

This can be avoided if the window automatically scrolls the list dup/down to
show the highlighted entry.

>> If multiple objects are selected together, the list should scroll to display
the last selected object.