Right Click on ChromeBook has a Left Click behaviour

On my ChromeBook, the Right Click button action (to show the default context menus on lineEdits (copy/paste...) or to show custom context menus) does have the same comportment than the Left Click, so I have not the capacity to show any context menu. I've tried 3 ways for the Right Click on my ChromeBook:

• The 2 taps on the trackpad
• The "Alt" + Click on the trackpad combo
• The Mouse connected via USB, right click

Each way produces a Left Click on my application, where, on others "official" apps (Google Chrome explorer for example), the Right Click has a correct behaviour (context menu).

Note that I use the same code for Windows and the context menus are shown by Right Click.