diff --git a/resources/default_skin/skin.tb.txt b/resources/default_skin/skin.tb.txt
index 10eafe2..586481e 100644
--- a/resources/default_skin/skin.tb.txt
+++ b/resources/default_skin/skin.tb.txt
@@ -282,6 +282,10 @@ elements
 		overrides
 			element Window.selected
 				state selected
+	Window.fullscreen
+		clone Window
+		expand 12
+		padding 0
 	Window.selected
 		bitmap window_active.png
 		cut 16
diff --git a/src/el/window.cc b/src/el/window.cc
index 6c82ee2..88bf13c 100644
--- a/src/el/window.cc
+++ b/src/el/window.cc
@@ -168,6 +168,14 @@ void Window::set_settings(WindowSettings settings) {
     title_close_button_.RemoveFromParent();
   }
 
+  if (any(settings & WindowSettings::kFullScreen)) {
+    set_background_skin(TBIDC("Window.fullscreen"));
+    set_rect(parent()->rect());
+    set_gravity(Gravity::kAll);
+  } else {
+    set_background_skin(TBIDC("Window"));
+  }
+
   // FIX: invalidate layout / resize window!
   Invalidate();
 }
diff --git a/src/el/window.h b/src/el/window.h
index 166b018..8532c18 100644
--- a/src/el/window.h
+++ b/src/el/window.h
@@ -19,12 +19,13 @@
 namespace el {
 
 enum class WindowSettings {
-  kNone = 0,           // Chrome less window without any other settings.
-  kTitleBar = 1,       // Show a title bar that can also move the window.
-  kResizable = 2,      // Show an element for resizing the window.
-  kCloseButton = 4,    // Show an element for closing the window.
-  kCanActivate = 8,    // Can be activated and deactivate other windows.
-  kDesignButton = 16,  // Show an element for opening a designer for the window.
+  kNone = 0,               // Chrome less window without any other settings.
+  kTitleBar = 1 << 0,      // Show a title bar that can also move the window.
+  kResizable = 1 << 1,     // Show an element for resizing the window.
+  kCloseButton = 1 << 2,   // Show an element for closing the window.
+  kCanActivate = 1 << 3,   // Can be activated and deactivate other windows.
+  kDesignButton = 1 << 4,  // Show a button to open a designer for the window.
+  kFullScreen = 1 << 5,    // Fully fill parent.
 
   kDefault =
       kTitleBar | kResizable | kCloseButton | kCanActivate | kDesignButton,
diff --git a/testbed/resources/test_ui.tb.txt b/testbed/resources/test_ui.tb.txt
index a65f8d8..039a9e2 100644
--- a/testbed/resources/test_ui.tb.txt
+++ b/testbed/resources/test_ui.tb.txt
@@ -21,6 +21,7 @@ LayoutBox: axis: y, distribution-position: "left top", distribution: "available"
 				id: "test-layout"
 				data: "test_toggle_containers.tb.txt"
 			Button: skin: "Button.flat", text: "Close with dim & alert", id: "Window.close"
+			Button: skin: "Button.flat", text: "Fullscreen Window", id: "test-fullscreen-window"
 			Button: skin: "Button.flat", text: "ResourceEditWindow", id: "test-resource-edit"
 
 	GroupBox: value: 0, text: "Layout tests"
diff --git a/testbed/testbed_application.cc b/testbed/testbed_application.cc
index 613a6c1..bbb427b 100644
--- a/testbed/testbed_application.cc
+++ b/testbed/testbed_application.cc
@@ -218,7 +218,7 @@ int app_main() {
   el::Initialize(application_backend->GetRenderer());
   CodeTextBox::RegisterInflater();
 
-  //el::io::FileManager::RegisterFileSystem(
+  // el::io::FileManager::RegisterFileSystem(
   //    std::make_unique<el::io::PosixFileSystem>("./resources"));
   el::io::FileManager::RegisterFileSystem(
       std::make_unique<el::io::PosixFileSystem>("./testbed/resources"));
@@ -727,6 +727,13 @@ bool AnimationsWindow::OnEvent(const Event& ev) {
   return DemoWindow::OnEvent(ev);
 }
 
+class FullScreenWindow : public DemoWindow {
+ public:
+  FullScreenWindow() : DemoWindow() {
+    set_settings(WindowSettings::kFullScreen);
+  }
+};
+
 // == MainWindow ==============================================================
 
 MainWindow::MainWindow() {
@@ -850,6 +857,9 @@ bool MainWindow::OnEvent(const Event& ev) {
       (new DemoWindow())->LoadResourceFile("test_skin_conditions01.tb.txt");
       (new DemoWindow())->LoadResourceFile("test_skin_conditions02.tb.txt");
       return true;
+    } else if (ev.target->id() == TBIDC("test-fullscreen-window")) {
+      new FullScreenWindow();
+      return true;
     } else if (ev.target->id() == TBIDC("test-resource-edit")) {
       ResourceEditWindow* res_edit_win = new ResourceEditWindow();
       res_edit_win->Load("resource_edit_test.tb.txt");