Thanx for your reply,

The domain isn't define in the tree,

for exemple, when i will display contracts, i find the all contracts, if i do somme filtre with search field like select contract of departement X, so in the tree i will have just the contrat with departement X. than i select one contract, i will have the formulaire contract, in this formulaire i want to create a bouton that have a function that will aplay for the all contract that exist (filtred) in the tree view and not just to the contract selected.

Thanx

you need to apply the same domain used in the action.

To get the domain used in the tree view you can run odoo in debug mode then Edit Action. You'll find the condition you are looking for in the domain value.