diff --git a/plugins/gui/include/gui/gatelibrary_management/gatelibrary_pages/bool_wizardpage.h b/plugins/gui/include/gui/gatelibrary_management/gatelibrary_pages/bool_wizardpage.h
index 2578e294629..4474ed50ead 100644
--- a/plugins/gui/include/gui/gatelibrary_management/gatelibrary_pages/bool_wizardpage.h
+++ b/plugins/gui/include/gui/gatelibrary_management/gatelibrary_pages/bool_wizardpage.h
@@ -55,6 +55,9 @@ namespace hal {
         QString mState;
         std::set<std::string> mLegalVariables;
 
+        const char* EMPTY = "Empty";
+        const char* VALID = "Valid";
+        const char* INVALID = "Invalid";
     Q_SIGNALS:
         void stateChanged(QString s);
     private Q_SLOTS:
@@ -63,6 +66,8 @@ namespace hal {
         BooleanFunctionEdit(std::set<std::string>& legalVar, QWidget* parent = nullptr);
         QString state() const { return mState; }
         void setState(const QString& s);
+        bool isValid() const { return mState == VALID; }
+        void setFunctionText(const QString& txt);
     };
 
     class BoolWizardPage:public QWizardPage
diff --git a/plugins/gui/resources/stylesheet/dark.qss b/plugins/gui/resources/stylesheet/dark.qss
index 7a2193d5cb9..0e6fbf84d44 100755
--- a/plugins/gui/resources/stylesheet/dark.qss
+++ b/plugins/gui/resources/stylesheet/dark.qss
@@ -1495,7 +1495,8 @@ hal--BooleanFunctionEdit[state="Empty"]
 
 hal--BooleanFunctionEdit[state="Invalid"]
 {
-    background: red;
+    background: #802010;
+    color     : #F0E0C0;
 }
 
 hal--GuiPluginManager
diff --git a/plugins/gui/src/gatelibrary_management/gatelibrary_pages/bool_wizardpage.cpp b/plugins/gui/src/gatelibrary_management/gatelibrary_pages/bool_wizardpage.cpp
index 60832a17fe7..208b75448dd 100644
--- a/plugins/gui/src/gatelibrary_management/gatelibrary_pages/bool_wizardpage.cpp
+++ b/plugins/gui/src/gatelibrary_management/gatelibrary_pages/bool_wizardpage.cpp
@@ -5,10 +5,10 @@
 namespace hal
 {
     BooleanFunctionEdit::BooleanFunctionEdit(std::set<std::string> &legalVar, QWidget *parent)
-        : QLineEdit(parent), mState("Valid"), mLegalVariables(legalVar)
+        : QLineEdit(parent), mState(VALID), mLegalVariables(legalVar)
     {
         connect(this, &QLineEdit::editingFinished, this, &BooleanFunctionEdit::handleEditingFinished);
-        setState("Empty");
+        setState(EMPTY); // do an active transition to enforce style
     }
 
     void BooleanFunctionEdit::setState(const QString &s)
@@ -26,15 +26,15 @@ namespace hal
     {
         if (text().isEmpty())
         {
-            setState("Empty");
+            setState(EMPTY);
             return;
         }
 
-        QString nextState = "Valid";  // think positive
+        QString nextState = VALID;  // think positive
 
         auto bfres = BooleanFunction::from_string(text().toStdString());
         if(bfres.is_error())
-            nextState = "Invalid";
+            nextState = INVALID;
         else
         {
             BooleanFunction bf = bfres.get();
@@ -44,7 +44,7 @@ namespace hal
             {
                 if (mLegalVariables.find(vname) == mLegalVariables.end())
                 {
-                    nextState = "Invalid";
+                    nextState = INVALID;
                     break;
                 }
             }
@@ -53,6 +53,11 @@ namespace hal
             setState(nextState);
     }
 
+    void BooleanFunctionEdit::setFunctionText(const QString &txt)
+    {
+        setText(txt);
+        handleEditingFinished();
+    }
 //--------------------------------------------
     BoolWizardPage::BoolWizardPage(QWidget* parent) : QWizardPage(parent)
     {
@@ -80,7 +85,7 @@ namespace hal
                 BooleanFunctionEdit* lineEdit = new BooleanFunctionEdit(input_pins, this);
                 mLayout->addWidget(label, boolFuncCnt, 0);
                 mLayout->addWidget(lineEdit, boolFuncCnt, 1);
-                lineEdit->setText(QString::fromStdString(bf.second.to_string()));
+                lineEdit->setFunctionText(QString::fromStdString(bf.second.to_string()));
                 boolFuncCnt++;
             }
         }