diff --git a/connectionwindow.cpp b/connectionwindow.cpp
index ad46e77..8a8ea45 100644
--- a/connectionwindow.cpp
+++ b/connectionwindow.cpp
@@ -48,6 +48,9 @@ ConnectionWindow::ConnectionWindow(QWidget *parent) :
 #endif
 
     connect(ui->btnOK, SIGNAL(clicked(bool)), this, SLOT(handleOKButton()));
+    connect(ui->rbGVRET, SIGNAL(toggled(bool)), this, SLOT(handleConnTypeChanged()));
+    connect(ui->rbKvaser, SIGNAL(toggled(bool)), this, SLOT(handleConnTypeChanged()));
+    connect(ui->rbSocketCAN, SIGNAL(toggled(bool)), this, SLOT(handleConnTypeChanged()));
 }
 
 ConnectionWindow::~ConnectionWindow()
@@ -60,6 +63,11 @@ void ConnectionWindow::showEvent(QShowEvent* event)
 {
     QDialog::showEvent(event);
     qDebug() << "Show connectionwindow";
+    handleConnTypeChanged();
+}
+
+void ConnectionWindow::handleConnTypeChanged()
+{
     if (ui->rbGVRET->isChecked()) getSerialPorts();
     if (ui->rbKvaser->isChecked()) getKvaserPorts();
     if (ui->rbSocketCAN->isChecked()) getSocketcanPorts();
diff --git a/connectionwindow.h b/connectionwindow.h
index 3315006..e098f67 100644
--- a/connectionwindow.h
+++ b/connectionwindow.h
@@ -43,6 +43,7 @@ public slots:
 
 private slots:
     void handleOKButton();
+    void handleConnTypeChanged();
 
 private:
     Ui::ConnectionWindow *ui;