How to create new tools?

Question

[UPDATE] 
 I'm using MicroStation V8i (SELECT series 3) and I want to make some changes to a "User-defined" toolbox created many years ago with another version. 
 This toolbox sets active a pre-established layer, linking everything I draw to a specific layer with specific parameters. Let's say we have the layer " Corte " associated to the first tool of this toolbox. If I select this tool, it then starts to place a line on "Corte" layer, with same colour and width established to that layer. This Toolbox is called " linhas ".

For that to happen, a DGN file (named " niveis ") was created in order to have those layers information, although it's not possible to draw in this file. It seems like it's used as a seed file further on, as fas as I know. This file is located in Workspace > Standards > Seed

I now basically just want to update some of their colours, as well as adding a new tool for a new layer, and for that I need to edit the original Toolbox setup. I've created a layer called " TESTE ", which I want to be yellow. I want to add a tool that automatically associates what I draw to that layer. 
 
 When I open the "Customize" window, this toolbox appears on the " Application Tools > MicroStation " rather than " User Tools ". I've digged a lot in this and other forums, and they all suggest that new toolboxes should be created in User Tools with DGNLIB files. 
 
 The next image shows what it looks when I reach the toolbox "linhas". It looks nothing but editable.

I've searched in every MIcrostation's data folder, and none of them has any file with this toolbox's name. I need some help locating this file so I can edit it. 
 My conclusion is that it was made right down the code. I need to reach the right file so I can edit it. I'm possibly looking for a .RSC or .MA file, so I can edit using MDL tools. 
 
 Another possible scenario is that, since it was created many years ago in an older version of Microstation, it may have been created in "User Tools" as a DGNLIB, and when it migrated to newer versions, it then went to Application Tools. 
 
 Any suggestions? 
 Thanks in advance

Jan Šlegr · Accepted Answer

Unknown said: I've updated the thread with some screenshots. 
 Ok, now it's a bit clearer. When your toolbox is displayed under MicroStation together with standard toolboxes, it's probably defined using old "pre-XM" customization. In such case it's stored in rsc file, named probably something like .m01 or .r01. It cannot be said what the file(s) location is, because it depends on your workspace configuration, but it will somewhere in your workspace. 
 I recommend to read this wiki article about customization migration. 
 After the toolbox will be converted to dgnlib, it will be possible to modify it using standard V8i customization tools. 
 With regards, 
 Jan

Lorys · Answer

I think its just keyins with icons associated tool pallet .. it may be a dgnlib but you need to click on more items like the menu bar and some of the others to see the keyins...a dgn lib would hold the level names just as well as a seed file, but the keyin lv=corte will create the level so no need for seed or dgnlib for those things .. pretty hard to be a detective without sitting at your pc.. 
 why not run a macro recorder and play with the tools and see what gets tracked? 
 I've forgotten prev8i how to create a tool pallet with icons that just run set keyins... but I'm sure someone will chime in or a search would find the process...