diff --git a/client/portstatswindow.cpp b/client/portstatswindow.cpp
index 0e7b73f..c06177b 100644
--- a/client/portstatswindow.cpp
+++ b/client/portstatswindow.cpp
@@ -47,6 +47,12 @@ PortStatsWindow::PortStatsWindow(PortGroupList *pgl, QWidget *parent)
     tvPortStats->verticalHeader()->setDefaultSectionSize(
         tvPortStats->verticalHeader()->minimumSectionSize());
 
+    connect(tvPortStats->selectionModel(),
+            SIGNAL(selectionChanged(
+                    const QItemSelection&, const QItemSelection&)),
+            SLOT(when_tvPortStats_selectionChanged(
+                    const QItemSelection&, const QItemSelection&)));
+    when_tvPortStats_selectionChanged(QItemSelection(), QItemSelection());
 }
 
 PortStatsWindow::~PortStatsWindow()
@@ -70,12 +76,43 @@ void PortStatsWindow::showMyReservedPortsOnly(bool enabled)
 }
 
 /* ------------- SLOTS (private) -------------- */
+
+void PortStatsWindow::when_tvPortStats_selectionChanged(
+        const QItemSelection& /*selected*/,
+        const QItemSelection& /*deselected*/)
+{
+    QModelIndexList indexList = 
+            tvPortStats->selectionModel()->selectedColumns();
+
+    if (proxyStatsModel) {
+        selectedColumns.clear();
+        foreach(QModelIndex index, indexList)
+            selectedColumns.append(proxyStatsModel->mapToSource(index));
+    }
+    else 
+        selectedColumns = indexList;
+
+    bool isEmpty = selectedColumns.isEmpty();
+
+    tbStartTransmit->setDisabled(isEmpty);
+    tbStopTransmit->setDisabled(isEmpty);
+
+    tbStartCapture->setDisabled(isEmpty);
+    tbStopCapture->setDisabled(isEmpty);
+    tbViewCapture->setDisabled(isEmpty);
+
+    tbClear->setDisabled(isEmpty);
+
+    tbResolveNeighbors->setDisabled(isEmpty);
+    tbClearNeighbors->setDisabled(isEmpty);
+}
+
 void PortStatsWindow::on_tbStartTransmit_clicked()
 {
     QList<PortStatsModel::PortGroupAndPortList>    pgpl;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), pgpl);
+    model->portListFromIndex(selectedColumns, pgpl);
 
     // Clear selected ports, portgroup by portgroup
     for (int i = 0; i < pgpl.size(); i++)
@@ -90,7 +127,7 @@ void PortStatsWindow::on_tbStopTransmit_clicked()
     QList<PortStatsModel::PortGroupAndPortList>    pgpl;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), pgpl);
+    model->portListFromIndex(selectedColumns, pgpl);
 
     // Clear selected ports, portgroup by portgroup
     for (int i = 0; i < pgpl.size(); i++)
@@ -106,7 +143,7 @@ void PortStatsWindow::on_tbStartCapture_clicked()
     QList<PortStatsModel::PortGroupAndPortList>    pgpl;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), pgpl);
+    model->portListFromIndex(selectedColumns, pgpl);
 
     // Clear selected ports, portgroup by portgroup
     for (int i = 0; i < pgpl.size(); i++)
@@ -122,7 +159,7 @@ void PortStatsWindow::on_tbStopCapture_clicked()
     QList<PortStatsModel::PortGroupAndPortList>    pgpl;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), pgpl);
+    model->portListFromIndex(selectedColumns, pgpl);
 
     // Clear selected ports, portgroup by portgroup
     for (int i = 0; i < pgpl.size(); i++)
@@ -138,7 +175,7 @@ void PortStatsWindow::on_tbViewCapture_clicked()
     QList<PortStatsModel::PortGroupAndPortList>    pgpl;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), pgpl);
+    model->portListFromIndex(selectedColumns, pgpl);
 
     // Clear selected ports, portgroup by portgroup
     for (int i = 0; i < pgpl.size(); i++)
@@ -153,7 +190,7 @@ void PortStatsWindow::on_tbResolveNeighbors_clicked()
     QList<PortStatsModel::PortGroupAndPortList>    portList;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), portList);
+    model->portListFromIndex(selectedColumns, portList);
 
     // Resolve ARP/ND for selected ports, portgroup by portgroup
     for (int i = 0; i < portList.size(); i++)
@@ -168,7 +205,7 @@ void PortStatsWindow::on_tbClearNeighbors_clicked()
     QList<PortStatsModel::PortGroupAndPortList>    portList;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), portList);
+    model->portListFromIndex(selectedColumns, portList);
 
     // Clear ARP/ND for ports, portgroup by portgroup
     for (int i = 0; i < portList.size(); i++)
@@ -183,7 +220,7 @@ void PortStatsWindow::on_tbClear_clicked()
     QList<PortStatsModel::PortGroupAndPortList>    portList;
 
     // Get selected ports
-    model->portListFromIndex(selectedColumns(), portList);
+    model->portListFromIndex(selectedColumns, portList);
 
     // Clear selected ports, portgroup by portgroup
     for (int i = 0; i < portList.size(); i++)
@@ -252,20 +289,3 @@ void PortStatsWindow::on_tbFilter_clicked()
             hv->moveSection(hv->visualIndex(newColumns.at(vi)), vi);
     }
 }
-
-/* ------------ Private Methods -------------- */
-
-QModelIndexList PortStatsWindow::selectedColumns()
-{
-    QModelIndexList indexList = 
-            tvPortStats->selectionModel()->selectedColumns();
-    QModelIndexList sourceIndexList;
-
-    if (!proxyStatsModel)
-        return indexList;
-
-    foreach(QModelIndex index, indexList)
-        sourceIndexList.append(proxyStatsModel->mapToSource(index));
-
-    return sourceIndexList;
-}
diff --git a/client/portstatswindow.h b/client/portstatswindow.h
index dfb5fbf..e5d993a 100644
--- a/client/portstatswindow.h
+++ b/client/portstatswindow.h
@@ -40,6 +40,9 @@ public slots:
     void showMyReservedPortsOnly(bool enabled);
 
 private slots:
+    void when_tvPortStats_selectionChanged(const QItemSelection &selected,
+                                           const QItemSelection &deselected);
+
     void on_tbStartTransmit_clicked();
     void on_tbStopTransmit_clicked();
 
@@ -56,11 +59,10 @@ private slots:
     void on_tbFilter_clicked();
 
 private:
-    QModelIndexList selectedColumns();
-
     PortGroupList           *pgl;
     PortStatsModel          *model;
     QSortFilterProxyModel   *proxyStatsModel;
+    QModelIndexList         selectedColumns;
 
 };
 
diff --git a/client/portstatswindow.ui b/client/portstatswindow.ui
index 1406a4b..f285b37 100644
--- a/client/portstatswindow.ui
+++ b/client/portstatswindow.ui
@@ -237,7 +237,7 @@
         <property name="orientation">
          <enum>Qt::Horizontal</enum>
         </property>
-        <property name="sizeHint">
+        <property name="sizeHint" stdset="0">
          <size>
           <width>40</width>
           <height>20</height>
@@ -263,7 +263,11 @@
     </widget>
    </item>
    <item>
-    <widget class="QTableView" name="tvPortStats"/>
+    <widget class="QTableView" name="tvPortStats">
+     <property name="selectionBehavior">
+      <enum>QAbstractItemView::SelectColumns</enum>
+     </property>
+    </widget>
    </item>
   </layout>
  </widget>