I want to pass context to a wizard that is called on a button click action from JS, I tried the following code but it didn't work.

on_click_new_message: function () {
        this.do_action({
            type: 'ir.actions.act_window',
            res_model: 'mail.compose.message',
            view_mode: 'form',
            view_type: 'form',
            views: [[false, 'form']],
            target: 'new',
            context: {'default_no_auto_thread': False, 'active_model': 'mail.message','subject':message.subject,'body':message.body}
        });
    },

The wizard appears but the values are not set.

Please let me know if any one knows