I found it !!

Sorry for the delay, Connect with admin user You have to activate the developer mode Go to opportunity menu et click from dropdown and choose “edit action”. Scrool down until “View”. You will see “Sequence”, “View Type” and “View”. Per default, Kanban has sequence=0, so, if you want have list view (Tree), you must change the sequence and Form view must just after be the "Tree" view else, when you create a new opportunity,the windows of opportunity will be shifted.

1. acivate developer mode ( find "about OpenERP")
2. edit actions ( from the new drop down window )
3. View Ref. ( change this to: project.project.tree )
4. Save
5. to get out of dev mode, remove ?debug=# from your url.