--- a/ui/certificate.cpp	Thu Apr 10 15:31:02 2014 +0200
+++ b/ui/certificate.cpp	Thu Apr 10 16:03:23 2014 +0200
@@ -164,3 +164,13 @@
 
     return retval;
 }
+
+void Certificate::setInstallCert(bool install)
+{
+    if (install && mBaseLine.startsWith("R:")) {
+        mBaseLine.replace(0, 1, "I");
+    }
+    else if (!install && mBaseLine.startsWith("I:")) {
+        mBaseLine.replace(0, 1, "R");
+    }
+}

--- a/ui/certificate.h	Thu Apr 10 15:31:02 2014 +0200
+++ b/ui/certificate.h	Thu Apr 10 16:03:23 2014 +0200
@@ -76,6 +76,12 @@
      **/
     bool isInstallCert() const {return mBaseLine.startsWith("I:");}
 
+    /** @brief Set the install instruction for this certificate.
+     *
+     * Set the base 64 line prefix to "I:" or "R:".
+     **/
+    void setInstallCert(bool install);
+
     /** @brief get the subject OU from the certificate */
     QString subjectOU() const {return mSubjectOU;}
 

--- a/ui/certificatetabledelegate.cpp	Thu Apr 10 15:31:02 2014 +0200
+++ b/ui/certificatetabledelegate.cpp	Thu Apr 10 16:03:23 2014 +0200
@@ -54,7 +54,6 @@
     // Get the current value from the model.
     QString value = index.data(Qt::DisplayRole).toString();
 
-    qDebug() << "model value is: " + index.data(Qt::DisplayRole).toString();
     // Find the index in comboxbox items and set the current index.
     QComboBox *comboBox = static_cast<QComboBox*>(editor);
     int ndx = comboBox->findData(value, Qt::UserRole);

--- a/ui/certificatetablemodel.cpp	Thu Apr 10 15:31:02 2014 +0200
+++ b/ui/certificatetablemodel.cpp	Thu Apr 10 16:03:23 2014 +0200
@@ -45,7 +45,16 @@
 bool CertificateTabelModel::setData(const QModelIndex &index,
     const QVariant &value, int role)
 {
-    //TODO
+    if (index.row() > certificates.size() || index.row() < 0) {
+        return false;
+    }
+
+    bool newValue = value.toBool();
+    Certificate &cert = certificates[index.row()];
+    cert.setInstallCert(newValue);
+
+    emit dataChanged(index, index);
+
     return true;
 }