import filedialogs.FileDialogs;
// ...

var res = FileDialogs.open_file("Open files", "", ["Cortex Resource Files", "*.cxr"], Option.Multiselect);
trace(res);

var res = FileDialogs.save_file("Save a file", ".cxr", ["Cortex Resource Files", "*.cxr"]);
trace(res);

var res = FileDialogs.select_folder("Select a folder");
trace(res);

var btn:Button = FileDialogs.message(
    "Unsaved Files",
    "Do you want to save the current document\n before closing the application?",
    Choice.Yes_No_Cancel, Icon.Warning);

FileDialogs.notify(
    "Cortex event", 
    "Something might be on fire 🔥", 
    Icon.Warning
);