diff --git a/gui/include/Catalogue/CatalogueEventsWidget.h b/gui/include/Catalogue/CatalogueEventsWidget.h
index 1886a81..5793d23 100644
--- a/gui/include/Catalogue/CatalogueEventsWidget.h
+++ b/gui/include/Catalogue/CatalogueEventsWidget.h
@@ -22,7 +22,7 @@ public:
     virtual ~CatalogueEventsWidget();
 
 public slots:
-    void populateWithCatalogue(const DBCatalogue &catalogue);
+    void populateWithCatalogues(const QVector<DBCatalogue> &catalogues);
 
 private:
     Ui::CatalogueEventsWidget *ui;
diff --git a/gui/include/Catalogue/CatalogueSideBarWidget.h b/gui/include/Catalogue/CatalogueSideBarWidget.h
index 7e6fb43..f1a6af1 100644
--- a/gui/include/Catalogue/CatalogueSideBarWidget.h
+++ b/gui/include/Catalogue/CatalogueSideBarWidget.h
@@ -15,9 +15,11 @@ class CatalogueSideBarWidget : public QWidget {
     Q_OBJECT
 
 signals:
-    void catalogueSelected(const DBCatalogue &catalogue);
+    void catalogueSelected(const QVector<DBCatalogue> &catalogues);
+    void databaseSelected(const QStringList &databases);
     void allEventsSelected();
     void trashSelected();
+    void selectionCleared();
 
 public:
     explicit CatalogueSideBarWidget(QWidget *parent = 0);
diff --git a/gui/src/Catalogue/CatalogueEventsWidget.cpp b/gui/src/Catalogue/CatalogueEventsWidget.cpp
index 887a1dc..66ab323 100644
--- a/gui/src/Catalogue/CatalogueEventsWidget.cpp
+++ b/gui/src/Catalogue/CatalogueEventsWidget.cpp
@@ -41,23 +41,17 @@ CatalogueEventsWidget::CatalogueEventsWidget(QWidget *parent)
         }
     });
 
-    connect(ui->tableView, &QTableView::clicked, [this](auto index) {
+    auto emitSelection = [this]() {
         QVector<DBEvent> events;
         for (auto rowIndex : ui->tableView->selectionModel()->selectedRows()) {
             events << impl->m_Model->getEvent(rowIndex.row());
         }
 
         emit this->eventsSelected(events);
-    });
+    };
 
-    connect(ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged, [this]() {
-        QVector<DBEvent> events;
-        for (auto rowIndex : ui->tableView->selectionModel()->selectedRows()) {
-            events << impl->m_Model->getEvent(rowIndex.row());
-        }
-
-        emit this->eventsSelected(events);
-    });
+    connect(ui->tableView, &QTableView::clicked, emitSelection);
+    connect(ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged, emitSelection);
 
     connect(ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged, [this]() {
         auto isNotMultiSelection = ui->tableView->selectionModel()->selectedRows().count() <= 1;
@@ -75,17 +69,24 @@ CatalogueEventsWidget::~CatalogueEventsWidget()
     delete ui;
 }
 
-void CatalogueEventsWidget::populateWithCatalogue(const DBCatalogue &catalogue)
+void CatalogueEventsWidget::populateWithCatalogues(const QVector<DBCatalogue> &catalogues)
 {
     auto &dao = sqpApp->catalogueController().getDao();
-    auto events = dao.getCatalogueEvents(catalogue);
 
-    QVector<DBEvent> eventVector;
-    for (auto event : events) {
-        eventVector << event;
+    QSet<QUuid> eventIds;
+    QVector<DBEvent> events;
+
+    for (auto catalogue : catalogues) {
+        auto catalogueEvents = dao.getCatalogueEvents(catalogue);
+        for (auto event : catalogueEvents) {
+            if (!eventIds.contains(event.getUniqId())) {
+                events << event;
+                eventIds.insert(event.getUniqId());
+            }
+        }
     }
 
     ui->tableView->setSortingEnabled(false);
-    impl->m_Model->setEvents(eventVector);
+    impl->m_Model->setEvents(events);
     ui->tableView->setSortingEnabled(true);
 }
diff --git a/gui/src/Catalogue/CatalogueExplorer.cpp b/gui/src/Catalogue/CatalogueExplorer.cpp
index fbaeb00..877b0e6 100644
--- a/gui/src/Catalogue/CatalogueExplorer.cpp
+++ b/gui/src/Catalogue/CatalogueExplorer.cpp
@@ -10,11 +10,30 @@ CatalogueExplorer::CatalogueExplorer(QWidget *parent)
 {
     ui->setupUi(this);
 
-    connect(ui->catalogues, &CatalogueSideBarWidget::catalogueSelected, [this](auto catalogue) {
-        ui->inspector->setCatalogue(catalogue);
-        ui->events->populateWithCatalogue(catalogue);
+    connect(ui->catalogues, &CatalogueSideBarWidget::catalogueSelected, [this](auto catalogues) {
+        if (catalogues.count() == 1) {
+            ui->inspector->setCatalogue(catalogues.first());
+        }
+        else {
+            ui->inspector->showPage(CatalogueInspectorWidget::Page::Empty);
+        }
+
+        ui->events->populateWithCatalogues(catalogues);
     });
 
+    connect(ui->catalogues, &CatalogueSideBarWidget::databaseSelected, [this](auto databases) {
+        ui->inspector->showPage(CatalogueInspectorWidget::Page::Empty);
+    });
+
+    connect(ui->catalogues, &CatalogueSideBarWidget::trashSelected,
+            [this]() { ui->inspector->showPage(CatalogueInspectorWidget::Page::Empty); });
+
+    connect(ui->catalogues, &CatalogueSideBarWidget::allEventsSelected,
+            [this]() { ui->inspector->showPage(CatalogueInspectorWidget::Page::Empty); });
+
+    connect(ui->catalogues, &CatalogueSideBarWidget::selectionCleared,
+            [this]() { ui->inspector->showPage(CatalogueInspectorWidget::Page::Empty); });
+
     connect(ui->events, &CatalogueEventsWidget::eventsSelected, [this](auto events) {
         if (events.count() == 1) {
             ui->inspector->setEvent(events.first());
diff --git a/gui/src/Catalogue/CatalogueSideBarWidget.cpp b/gui/src/Catalogue/CatalogueSideBarWidget.cpp
index aa91bc0..158e96f 100644
--- a/gui/src/Catalogue/CatalogueSideBarWidget.cpp
+++ b/gui/src/Catalogue/CatalogueSideBarWidget.cpp
@@ -32,22 +32,60 @@ CatalogueSideBarWidget::CatalogueSideBarWidget(QWidget *parent)
     ui->setupUi(this);
     impl->configureTreeWidget(ui->treeWidget);
 
-    auto emitSelection = [this](auto item) {
-        switch (item->type()) {
-            case CATALOGUE_ITEM_TYPE:
-                emit this->catalogueSelected(
-                    static_cast<CatalogueTreeWidgetItem *>(item)->catalogue());
-                break;
-            case ALL_EVENT_ITEM_TYPE:
-                emit this->allEventsSelected();
-                break;
-            case TRASH_ITEM_TYPE:
-                emit this->trashSelected();
-                break;
-            case DATABASE_ITEM_TYPE:
-            default:
-                break;
+    auto emitSelection = [this]() {
+
+        auto selectedItems = ui->treeWidget->selectedItems();
+        if (selectedItems.isEmpty()) {
+            emit this->selectionCleared();
+        }
+        else {
+            QVector<DBCatalogue> catalogues;
+            QStringList databases;
+            int selectionType = selectedItems.first()->type();
+
+            for (auto item : ui->treeWidget->selectedItems()) {
+                if (item->type() == selectionType) {
+                    switch (selectionType) {
+                        case CATALOGUE_ITEM_TYPE:
+                            catalogues.append(
+                                static_cast<CatalogueTreeWidgetItem *>(item)->catalogue());
+                            break;
+                        case DATABASE_ITEM_TYPE:
+                            selectionType = DATABASE_ITEM_TYPE;
+                            databases.append(item->text(0));
+                        case ALL_EVENT_ITEM_TYPE: // fallthrough
+                        case TRASH_ITEM_TYPE:     // fallthrough
+                        default:
+                            break;
+                    }
+                }
+                else {
+                    // Incoherent multi selection
+                    selectionType = -1;
+                    break;
+                }
+            }
+
+            switch (selectionType) {
+                case CATALOGUE_ITEM_TYPE:
+                    emit this->catalogueSelected(catalogues);
+                    break;
+                case DATABASE_ITEM_TYPE:
+                    emit this->databaseSelected(databases);
+                    break;
+                case ALL_EVENT_ITEM_TYPE:
+                    emit this->allEventsSelected();
+                    break;
+                case TRASH_ITEM_TYPE:
+                    emit this->trashSelected();
+                    break;
+                default:
+                    emit this->selectionCleared();
+                    break;
+            }
         }
+
+
     };
 
     connect(ui->treeWidget, &QTreeWidget::itemClicked, emitSelection);
diff --git a/gui/ui/Catalogue/CatalogueSideBarWidget.ui b/gui/ui/Catalogue/CatalogueSideBarWidget.ui
index ca3e22d..34e03a1 100644
--- a/gui/ui/Catalogue/CatalogueSideBarWidget.ui
+++ b/gui/ui/Catalogue/CatalogueSideBarWidget.ui
@@ -34,7 +34,7 @@
         <string>+</string>
        </property>
        <property name="icon">
-        <iconset>
+        <iconset resource="../../resources/sqpguiresources.qrc">
          <normaloff>:/icones/add.png</normaloff>:/icones/add.png</iconset>
        </property>
        <property name="autoRaise">
@@ -48,7 +48,7 @@
         <string> - </string>
        </property>
        <property name="icon">
-        <iconset>
+        <iconset resource="../../resources/sqpguiresources.qrc">
          <normaloff>:/icones/remove.png</normaloff>:/icones/remove.png</iconset>
        </property>
        <property name="autoRaise">
@@ -73,6 +73,9 @@
    </item>
    <item>
     <widget class="QTreeWidget" name="treeWidget">
+     <property name="selectionMode">
+      <enum>QAbstractItemView::ExtendedSelection</enum>
+     </property>
      <attribute name="headerVisible">
       <bool>false</bool>
      </attribute>
@@ -85,6 +88,9 @@
    </item>
   </layout>
  </widget>
- <resources/>
+ <resources>
+  <include location="../../resources/sqpguiresources.qrc"/>
+  <include location="../../resources/sqpguiresources.qrc"/>
+ </resources>
  <connections/>
 </ui>