Hi,
in the Lua Examples folder, ProbeToFile have a look at m401.mcs.
It first opens a frame, then a panel within the frame and finally a file dialogue within the panel.
wxLua is a whole learning curve on its own. wxFormBuilder is a very good tutor, you just have to roll up your sleeves and get stuck in.
You can bet it will take several weeks to get to grips with it. Remember this is a software suite that Mach4 incorporates into itself,
its not Mach4 itself. NFS has no part in determining the style and development of wxWidgets.
Given the learning curve of wxLua are you 100% sure you are prepared to put the effort into the two features you want?
I am no expert in either Lua nor, and in particular, wxLua but I will help if you are that keen, but you need to be keen
or it will be a wasted effort.
Craig