diff --git a/pytec/pytec/gui/view/ctrl_panel.py b/pytec/pytec/gui/view/ctrl_panel.py
index 9e04a55..5d138e1 100644
--- a/pytec/pytec/gui/view/ctrl_panel.py
+++ b/pytec/pytec/gui/view/ctrl_panel.py
@@ -78,14 +78,15 @@ class CtrlPanel(QObject):
         for ch, tree in enumerate(self.trees_ui):
             tree.setHeaderHidden(True)
             tree.setParameters(self.params[ch], showTop=False)
-            self.params[ch].setValue = self._setValue
-            self.params[ch].sigTreeStateChanged.connect(sigTreeStateChanged_handle)
 
             set_tree_label_tips(tree)
 
-            for handle in sigActivated_handles[ch]:
-                self.params[ch].child(*handle[0]).sigActivated.connect(handle[1])
+        for ch, param in enumerate(self.params):
+            self.params[ch].setValue = self._setValue
+            param.sigTreeStateChanged.connect(sigTreeStateChanged_handle)
 
+            for handle in sigActivated_handles[ch]:
+                param.child(*handle[0]).sigActivated.connect(handle[1])
 
     def _setValue(self, value, blockSignal=None):
         """