diff --git a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatContainerTest.java b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatContainerTest.java
index a8e421bf..0a9c954d 100644
--- a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatContainerTest.java
+++ b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatContainerTest.java
@@ -24,6 +24,7 @@ import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.awt.event.MouseWheelEvent;
 import java.awt.event.MouseWheelListener;
+import java.util.Random;
 import javax.swing.*;
 import javax.swing.border.*;
 import com.formdev.flatlaf.FlatLaf;
@@ -178,6 +179,20 @@ public class FlatContainerTest
 				tabbedPane.addTab( "Tab 4", new JLabel( "non-opaque content", SwingConstants.CENTER ) );
 				break;
 
+			case 4:
+				tabbedPane.addTab( "Tab 5", new JLabel( "random background content", SwingConstants.CENTER ) {
+					Random random = new Random();
+
+					@Override
+					protected void paintComponent( Graphics g ) {
+						g.setColor( new Color( random.nextInt() ) );
+						g.fillRect( 0, 0, getWidth(), getHeight() );
+
+						super.paintComponent( g );
+					}
+				} );
+				break;
+
 			default:
 				int index = tabbedPane.getTabCount() + 1;
 				tabbedPane.addTab( "Tab " + index, createTab( "tab content " + index ) );
diff --git a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/jideoss/FlatJideOssContainerTest.java b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/jideoss/FlatJideOssContainerTest.java
index 1ac9bcd5..4c3d7fd4 100644
--- a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/jideoss/FlatJideOssContainerTest.java
+++ b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/jideoss/FlatJideOssContainerTest.java
@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.testing.jideoss;
 
 import java.awt.*;
+import java.util.Random;
 import javax.swing.*;
 import javax.swing.border.*;
 import com.formdev.flatlaf.FlatClientProperties;
@@ -140,6 +141,20 @@ public class FlatJideOssContainerTest
 				tabbedPane.addTab( "Tab 4", new JLabel( "non-opaque content", SwingConstants.CENTER ) );
 				break;
 
+			case 4:
+				tabbedPane.addTab( "Tab 5", new JLabel( "random background content", SwingConstants.CENTER ) {
+					Random random = new Random();
+
+					@Override
+					protected void paintComponent( Graphics g ) {
+						g.setColor( new Color( random.nextInt() ) );
+						g.fillRect( 0, 0, getWidth(), getHeight() );
+
+						super.paintComponent( g );
+					}
+				} );
+				break;
+
 			default:
 				int index = tabbedPane.getTabCount() + 1;
 				tabbedPane.addTab( "Tab " + index, createTab( "tab content " + index ) );