If I have a namespace defined and then attempt to use it like:
"NamespaceName." (should be "NamespaceName::"), the suggestion listbox will appear. A nit yes, but it would be nice if it would only appear when the proper syntax was used.
If you are seeing a suggestion listbox then these appear at a various "odd" times, by design. They appear when ever VA has something to offer that it thinks might help. If you are typing a similar piece of code, or accessing a commonly used member of the namespace, then this might actually be quite useful, since you can accept the suggestion and then change the dot to ::