diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java
index 5edffcd5..0506390b 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java
@@ -69,10 +69,11 @@ public class FlatRootPaneUI
 	static final boolean canUseJBRCustomDecorations
 		= SystemInfo.IS_JETBRAINS_JVM_11_OR_LATER && SystemInfo.IS_WINDOWS_10_OR_LATER;
 
-	private JRootPane rootPane;
-	private FlatTitlePane titlePane;
+	protected JRootPane rootPane;
+	protected FlatTitlePane titlePane;
+	protected FlatWindowResizer windowResizer;
+
 	private LayoutManager oldLayout;
-	private FlatWindowResizer windowResizer;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatRootPaneUI();
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
index 2a7fd6bd..8659b149 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
@@ -90,30 +90,31 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatTitlePane
 	extends JComponent
 {
-	private final Color activeBackground = UIManager.getColor( "TitlePane.background" );
-	private final Color inactiveBackground = UIManager.getColor( "TitlePane.inactiveBackground" );
-	private final Color activeForeground = UIManager.getColor( "TitlePane.foreground" );
-	private final Color inactiveForeground = UIManager.getColor( "TitlePane.inactiveForeground" );
-	private final Color embeddedForeground = UIManager.getColor( "TitlePane.embeddedForeground" );
+	protected final Color activeBackground = UIManager.getColor( "TitlePane.background" );
+	protected final Color inactiveBackground = UIManager.getColor( "TitlePane.inactiveBackground" );
+	protected final Color activeForeground = UIManager.getColor( "TitlePane.foreground" );
+	protected final Color inactiveForeground = UIManager.getColor( "TitlePane.inactiveForeground" );
+	protected final Color embeddedForeground = UIManager.getColor( "TitlePane.embeddedForeground" );
 
-	private final Insets menuBarMargins = UIManager.getInsets( "TitlePane.menuBarMargins" );
-	private final Dimension iconSize = UIManager.getDimension( "TitlePane.iconSize" );
-	private final int buttonMaximizedHeight = UIManager.getInt( "TitlePane.buttonMaximizedHeight" );
+	protected final Insets menuBarMargins = UIManager.getInsets( "TitlePane.menuBarMargins" );
+	protected final Dimension iconSize = UIManager.getDimension( "TitlePane.iconSize" );
+	protected final int buttonMaximizedHeight = UIManager.getInt( "TitlePane.buttonMaximizedHeight" );
 
-	private final JRootPane rootPane;
+	protected final JRootPane rootPane;
 
-	private JPanel leftPanel;
-	private JLabel iconLabel;
-	private JComponent menuBarPlaceholder;
-	private JLabel titleLabel;
-	private JPanel buttonPanel;
-	private JButton iconifyButton;
-	private JButton maximizeButton;
-	private JButton restoreButton;
-	private JButton closeButton;
+	protected JPanel leftPanel;
+	protected JLabel iconLabel;
+	protected JComponent menuBarPlaceholder;
+	protected JLabel titleLabel;
+	protected JPanel buttonPanel;
+	protected JButton iconifyButton;
+	protected JButton maximizeButton;
+	protected JButton restoreButton;
+	protected JButton closeButton;
+
+	protected Window window;
 
 	private final Handler handler;
-	private Window window;
 
 	public FlatTitlePane( JRootPane rootPane ) {
 		this.rootPane = rootPane;
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
index c8f0365b..3c1f569c 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
@@ -51,15 +51,15 @@ public class FlatWindowResizer
 	extends JComponent
 	implements PropertyChangeListener, WindowStateListener, ComponentListener
 {
-	private final static Integer WINDOW_RESIZER_LAYER = JLayeredPane.DRAG_LAYER + 1;
+	protected final static Integer WINDOW_RESIZER_LAYER = JLayeredPane.DRAG_LAYER + 1;
 
-	private final JRootPane rootPane;
+	protected final JRootPane rootPane;
 
-	private final int borderDragThickness = FlatUIUtils.getUIInt( "RootPane.borderDragThickness", 5 );
-	private final int cornerDragWidth = FlatUIUtils.getUIInt( "RootPane.cornerDragWidth", 16 );
-	private final boolean honorMinimumSizeOnResize = UIManager.getBoolean( "RootPane.honorMinimumSizeOnResize" );
+	protected final int borderDragThickness = FlatUIUtils.getUIInt( "RootPane.borderDragThickness", 5 );
+	protected final int cornerDragWidth = FlatUIUtils.getUIInt( "RootPane.cornerDragWidth", 16 );
+	protected final boolean honorMinimumSizeOnResize = UIManager.getBoolean( "RootPane.honorMinimumSizeOnResize" );
 
-	private Window window;
+	protected Window window;
 
 	public FlatWindowResizer( JRootPane rootPane ) {
 		this.rootPane = rootPane;