diff --git a/src/DockAreaTitleBar_p.h b/src/DockAreaTitleBar_p.h
index c159de2..b94a510 100644
--- a/src/DockAreaTitleBar_p.h
+++ b/src/DockAreaTitleBar_p.h
@@ -1,5 +1,5 @@
-#ifndef DockAreaTitleBarPH
-#define DockAreaTitleBarPH
+#ifndef DockAreaTitleBar_pH
+#define DockAreaTitleBar_pH
 /*******************************************************************************
 ** Qt Advanced Docking System
 ** Copyright (C) 2017 Uwe Kindler
@@ -39,16 +39,17 @@ namespace ads
 {
 using tTitleBarButton = QToolButton;
 
-   /**
-   * Title bar button of a dock area that customizes tTitleBarButton appearance/behaviour
-   * according to various config flags such as:
-   * CDockManager::DockAreaHas_xxx_Button - if set to 'false' keeps the button always invisible
-   * CDockManager::DockAreaHideDisabledButtons - if set to 'true' hides button when it is disabled
-   */
+/**
+* Title bar button of a dock area that customizes tTitleBarButton appearance/behaviour
+* according to various config flags such as:
+* CDockManager::DockAreaHas_xxx_Button - if set to 'false' keeps the button always invisible
+* CDockManager::DockAreaHideDisabledButtons - if set to 'true' hides button when it is disabled
+*/
 class CTitleBarButton : public tTitleBarButton
 {
 	Q_OBJECT
 		
+private:
 	bool Visible = true;
 	bool HideWhenDisabled = false;
 
@@ -90,4 +91,4 @@ public:
 }
  // namespace ads
 //-----------------------------------------------------------------------------
-#endif // DockAreaTitleBarPH
+#endif // DockAreaTitleBar_pH
diff --git a/src/src.pro b/src/src.pro
index 73367b0..f117495 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -41,6 +41,7 @@ HEADERS += \
     FloatingDragPreview.h \
     DockOverlay.h \
     DockSplitter.h \
+    DockAreaTitleBar_p.h \
     DockAreaTitleBar.h \
     ElidingLabel.h \
     IconProvider.h \