[TxMt] Impossible to delete references to files in a project

[Alain Matthes]

Hello:)

I'm with Leopard 10.5.1 and TextMate 1.5.7 (1436).

I created a latex project : i dropped some files .sty and a folder
  with subfolders in the project drawer.

my project :

file_a.sty
file_b.sty
mainfolder
   file_c.tex
   file_d.tex
  subfolder
       file_e.tex
       file_f.tex


I can't remove the references to subfolders  and I can't remove the  
references
to a single file inside a subfolder  like file_e.tex

I can't delete the reference of a file in the main folder like  
file_c.tex
I can only delete the reference to the main folder

In conclusion, I can remove only the references to file_a.sty and
  to mainfolder :(


When I say : I can't delete, I need to say that's when I close TM
and  when I re-open , the files are always in the project drawer .

I try to save the project but the result is the same but move to trash
works well :)
Perhaps i take a wrong way to create my project
An idea ???

Regards Alain