I have managed to add it and define the list etc but I must have
inadvertently changed some property and the list appears to the right of the
combo and is just a thin sliver (can't read the names). I have been through
all the properties and none of them seem to affect it. The list width is the
obvious one but it doesn't seem to work. Anyone any ideas how to get it in
the right position and right width?

Thanks, Mark