GroupBoxCollapser::installIntoGroupBox2 used for bg form

GUI/Model/Device/InstrumentItems.h

@@ -104,9 +104,6 @@ public:
     bool isExpandPolarizerAlanyzer() const { return expandPolarizerAlanyzer; }
     void setExpandPolarizerAlanyzer(bool b) { expandPolarizerAlanyzer = b; }
 
-    bool isExpandEnvironment() const { return expandEnvironment; }
-    void setExpandEnvironment(bool b) { expandEnvironment = b; }
-
 protected:
     explicit InstrumentItem(const QString& modelType);
 

GUI/View/Device/BackgroundForm.cpp

@@ -37,10 +37,7 @@ BackgroundForm::BackgroundForm(QWidget* parent, InstrumentItem* instrument)
     m_formLayout->addRow("Background type:", backgroundTypeCombo);
 
     createBackgroundWidgets();
-    auto* collapser = GroupBoxCollapser::installIntoGroupBox(this);
-    collapser->setExpanded(instrument->isExpandEnvironment());
-    connect(collapser, &GroupBoxCollapser::toggled, this,
-            [instrument](bool b) { instrument->setExpandEnvironment(b); });
+    GroupBoxCollapser::installIntoGroupBox2(this, instrument->expandEnvironment);
 }
 
 void BackgroundForm::createBackgroundWidgets()