Bon pour ta réponse, tu ne peux pas changer le titre d'un graphique (visiblement, tout vient de row source y compris le titre du graphique, cf texte de Micorsoft dessous).
Ce que tu dois pouvoir faire, c'est travailler à partir d'un activeX Microsoft Office Chart 9.0 lié à ton recordset sur lequel tu auras plus de possibilité.
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I change the chart in my form or report, but the changes aren't retained.
A chart is made up of information from the following places, in order of precedence:
The data in the underlying table or other record source.
The chart's RowSource property
The Microsoft Graph application
Microsoft Access regenerates the chart each time you print or preview the chart, or switch to Form view. Therefore, changes that you make using Microsoft Graph might be overwritten by the underlying data or the RowSource property.
Keep the following in mind when you change your chart:
Changes to the underlying data (such as the format of the data) have precedence over other changes. However, if the RowSource property setting contains a calculated field, such as =Format([StartDate],"MMM" ), the format is determined by the result of the calculation, not by the underlying data.
Changes in the RowSource property, such as changes to the chart's title and labels, can be overwritten by changes in the underlying data.
Changes you make using Microsoft Graph, such as changes based on the data, can be overwritten by changes you make in the underlying table or other record source or in the RowSource property.