diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/gui/Window.java b/api/src/main/java/com/bartlomiejpluta/base/api/gui/Window.java
index f90a944e..948d230e 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/api/gui/Window.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/gui/Window.java
@@ -11,7 +11,7 @@ public interface Window extends Widget {
 
    <T extends Component> T reference(String ref, Class<T> type);
 
-   default void onOpen(WindowManager manager) {
+   default void onOpen(WindowManager manager, Object[] args) {
       // do nothing
    }
 
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/gui/WindowManager.java b/api/src/main/java/com/bartlomiejpluta/base/api/gui/WindowManager.java
index f2b32c84..3b3bc503 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/api/gui/WindowManager.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/gui/WindowManager.java
@@ -63,7 +63,7 @@ public final class WindowManager extends BaseWidget {
       throw new UnsupportedOperationException("Window Manager is hardcoded to be of MATCH_PARENT mode");
    }
 
-   public void open(Window window) {
+   public void open(Window window, Object... args) {
       requireNonNull(window, "Window cannot be null");
 
       if (windows.isEmpty()) {
@@ -72,7 +72,7 @@ public final class WindowManager extends BaseWidget {
 
       windows.addLast(window);
       window.setParent(this);
-      window.onOpen(this);
+      window.onOpen(this, args != null ? args : new Object[] {});
    }
 
    private void forwardKeyEventToTopWindow(KeyEvent event) {
diff --git a/api/src/main/java/com/bartlomiejpluta/base/lib/gui/BaseWindow.java b/api/src/main/java/com/bartlomiejpluta/base/lib/gui/BaseWindow.java
index 0e5b6259..f790863e 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/lib/gui/BaseWindow.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/lib/gui/BaseWindow.java
@@ -92,7 +92,7 @@ public abstract class BaseWindow extends BaseWidget implements Window {
    }
 
    @Override
-   public void onOpen(WindowManager manager) {
+   public void onOpen(WindowManager manager, Object[] args) {
       this.manager = manager;
    }