local MyTable = file.Find("Poses/*.txt");
//returns a table where MyTable[1] = first file, MyTable[2] = second file, etc.

panel:AddControl("ListBox", {Label = "A label", Description = "A description", MenuButton = true, Height = 200, Options = MyTable} );
/* prints a number for each file in the Data/Poses folder, for instance, if there were 3 files:
1
2
3
*/