The function QuickSelect() should present a small drop down menu. The same kind of menu you get when pressing F7, F8 or F9.
I wrote a PlugIn with the FDK for FrameMaker 2010 where this behaved correctly.
result = F_ApiQuickSelect(docId, (StringT)"Please Select: ", &somestrings);
In FrameMaker 2017 the same PlugIn (without recompilation) doesn't open the menu anymore.
Instead it just returns immediatly with a return value of -1. FA_Errno is not set. So, judging from the return value, this looks like the user dismissed the dialogue right away. But that is not the case, there is no menu and no intereaction at all.
The rest of the plugin runs without flaws. Recompilation with FDK 2017 did not fix this.
The same behaviour can be seen when running the following from ExtendScript: