diff --git a/lib/window.dart b/lib/window.dart
index db7795f..7e42e11 100644
--- a/lib/window.dart
+++ b/lib/window.dart
@@ -151,6 +151,21 @@ const _kRemoveToolbar = "RemoveToolbar";
 /// (macOS only).
 const _kSetToolbarStyle = "SetToolbarStyle";
 
+/// (macOS only)
+const _kEnableShadow = "EnableShadow";
+
+/// (macOS only)
+const _kDisableShadow = "DisableShadow";
+
+/// (macOS only)
+const _kInvalidateShadows = "InvalidateShadows";
+
+/// (macOS only)
+const _kAddEmptyMaskImage = "AddEmptyMaskImage";
+
+/// (macOS only)
+const _kRemoveMaskImage = "RemoveMaskImage";
+
 final MethodChannel _kChannel = const MethodChannel(_kChannelName);
 final Completer<void> _kCompleter = new Completer<void>();
 
@@ -626,4 +641,36 @@ class Window {
       'toolbarStyle': toolbarStyle.name,
     });
   }
+
+  /// Enables the window's shadow (macOS only).
+  static Future<void> enableShadow() async {
+    await _kCompleter.future;
+    await _kChannel.invokeMethod(_kEnableShadow, {});
+  }
+
+  /// Disables the window's shadow (macOS only).
+  static Future<void> disableShadow() async {
+    await _kCompleter.future;
+    await _kChannel.invokeMethod(_kDisableShadow, {});
+  }
+
+  /// Invalidates the window's shadow (macOS only).
+  static Future<void> invalidateShadows() async {
+    await _kCompleter.future;
+    await _kChannel.invokeMethod(_kInvalidateShadows, {});
+  }
+
+  /// Adds an empty mask image to the window's view (macOS only).
+  ///
+  /// This will effectively disable the `NSVisualEffectView`'s effect.
+  static Future<void> addEmptyMaskImage() async {
+    await _kCompleter.future;
+    await _kChannel.invokeMethod(_kAddEmptyMaskImage, {});
+  }
+
+  /// Removes the window's mask image (macOS only).
+  static Future<void> removeMaskImage() async {
+    await _kCompleter.future;
+    await _kChannel.invokeMethod(_kRemoveMaskImage, {});
+  }
 }
diff --git a/macos/Classes/FlutterAcrylicPlugin.swift b/macos/Classes/FlutterAcrylicPlugin.swift
index 4095e2b..001e091 100644
--- a/macos/Classes/FlutterAcrylicPlugin.swift
+++ b/macos/Classes/FlutterAcrylicPlugin.swift
@@ -323,6 +323,36 @@ public class FlutterAcrylicPlugin: NSObject, FlutterPlugin {
             result(true)
             break
             
+        case "EnableShadow":
+            MainFlutterWindowManipulator.enableShadow()
+
+            result(true)
+            break
+
+        case "DisableShadow":
+            MainFlutterWindowManipulator.disableShadow()
+
+            result(true)
+            break
+
+        case "InvalidateShadows":
+            MainFlutterWindowManipulator.invalidateShadows()
+
+            result(true)
+            break
+
+        case "AddEmptyMaskImage":
+            MainFlutterWindowManipulator.addEmptyMaskImage()
+
+            result(true)
+            break
+
+        case "RemoveMaskImage":
+            MainFlutterWindowManipulator.removeMaskImage()
+
+            result(true)
+            break
+            
         default:
             result(FlutterMethodNotImplemented)
             break
diff --git a/macos/Classes/MainFlutterWindowManipulator.swift b/macos/Classes/MainFlutterWindowManipulator.swift
index df3b7b1..299e9f9 100644
--- a/macos/Classes/MainFlutterWindowManipulator.swift
+++ b/macos/Classes/MainFlutterWindowManipulator.swift
@@ -342,9 +342,9 @@ public class MainFlutterWindowManipulator {
             return
         }
         
-        self.mainFlutterWindow?.contentView?.superview?.appearance = NSAppearance(named: dark ? .darkAqua : .aqua)
+        self.mainFlutterWindow!.contentView?.superview?.appearance = NSAppearance(named: dark ? .darkAqua : .aqua)
         
-        self.mainFlutterWindow?.invalidateShadow()
+        self.mainFlutterWindow!.invalidateShadow()
     }
     
     @available(macOS 10.14, *)
@@ -354,10 +354,10 @@ public class MainFlutterWindowManipulator {
             return
         }
         
-        let blurryContainerViewController = self.mainFlutterWindow?.contentViewController as! BlurryContainerViewController;
+        let blurryContainerViewController = self.mainFlutterWindow!.contentViewController as! BlurryContainerViewController;
         (blurryContainerViewController.view as! NSVisualEffectView).material = material
         
-        self.mainFlutterWindow?.invalidateShadow()
+        self.mainFlutterWindow!.invalidateShadow()
     }
     
     @available(macOS 10.14, *)
@@ -388,19 +388,81 @@ public class MainFlutterWindowManipulator {
     }
     
     public static func addToolbar() {
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
         if #available(macOS 10.13, *) {
             let newToolbar = NSToolbar()
 
-            self.mainFlutterWindow?.toolbar = newToolbar
+            self.mainFlutterWindow!.toolbar = newToolbar
         }
     }
     
     public static func removeToolbar() {
-        self.mainFlutterWindow?.toolbar = nil
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
+        self.mainFlutterWindow!.toolbar = nil
     }
     
     @available(macOS 11.0, *)
     public static func setToolbarStyle(toolbarStyle: NSWindow.ToolbarStyle) {
-        self.mainFlutterWindow?.toolbarStyle = toolbarStyle
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
+        self.mainFlutterWindow!.toolbarStyle = toolbarStyle
+    }
+    
+    public static func enableShadow() {
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
+        self.mainFlutterWindow!.hasShadow = true
+    }
+    
+    public static func disableShadow() {
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
+        self.mainFlutterWindow!.hasShadow = false
+    }
+    
+    public static func invalidateShadows() {
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
+        self.mainFlutterWindow!.invalidateShadow()
+    }
+    
+    public static func addEmptyMaskImage() {
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
+        let blurryContainerViewController = self.mainFlutterWindow!.contentViewController as! BlurryContainerViewController;
+        (blurryContainerViewController.view as! NSVisualEffectView).maskImage = NSImage()
+    }
+    
+    public static func removeMaskImage() {
+        if (self.mainFlutterWindow == nil) {
+            printNotStartedWarning()
+            return
+        }
+        
+        let blurryContainerViewController = self.mainFlutterWindow!.contentViewController as! BlurryContainerViewController;
+        (blurryContainerViewController.view as! NSVisualEffectView).maskImage = nil
     }
 }