diff --git a/particle-track-and-trace/src/QT/MainWindow.cpp b/particle-track-and-trace/src/QT/MainWindow.cpp
index 014f441..40b4685 100644
--- a/particle-track-and-trace/src/QT/MainWindow.cpp
+++ b/particle-track-and-trace/src/QT/MainWindow.cpp
@@ -81,15 +81,14 @@ void MainWindow::setupTechniques() {
 
 void MainWindow::on_FirstButton_clicked(bool checked) {
   if (checked) {
-    cout << "clicked button 1!" << endl;
+    ui->program->setActiveTechnique(0);
   }
 }
 
 
 void MainWindow::on_SecondButton_clicked(bool checked) {
   if (checked) {
-    cout << "clicked button 2!" << endl;
-
+    ui->program->setActiveTechnique(1);
   }
 }