--- a/ui/certificate.h	Tue Apr 01 17:39:11 2014 +0200
+++ b/ui/certificate.h	Wed Apr 02 09:24:57 2014 +0200
@@ -19,6 +19,13 @@
 {
 public:
 
+    enum Status {
+        InstallNew = 1,
+        InstallOld,
+        RemoveNew,
+        RemoveOld
+    };
+
     /** @brief construct a certificate from a line of a certificate list.
      *
      * The first two characters of the string are expected to be

--- a/ui/mainwindow.cpp	Tue Apr 01 17:39:11 2014 +0200
+++ b/ui/mainwindow.cpp	Wed Apr 02 09:24:57 2014 +0200
@@ -39,6 +39,7 @@
     createMenuBar();
     createContent();
     qRegisterMetaType<SSLConnection::ErrorCode>("SSLConnection::ErrorCode");
+    qRegisterMetaType<Certificate::Status>("Certificate::Status");
 
     connect(mTrayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
             this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));