diff --git a/src/Avalonia.Native.OSX/window.mm b/src/Avalonia.Native.OSX/window.mm
index 62f5546440..a115e03f3a 100644
--- a/src/Avalonia.Native.OSX/window.mm
+++ b/src/Avalonia.Native.OSX/window.mm
@@ -172,6 +172,10 @@ protected:
 
 class WindowImpl : public WindowBaseImpl, public IAvnWindow
 {
+private:
+    bool _canResize = true;
+    bool _hasDecorations = true;
+    
     BEGIN_INTERFACE_MAP()
     INHERIT_INTERFACE_MAP(WindowBaseImpl)
     INTERFACE_MAP_ENTRY(IAvnWindow, IID_IAvnWindow)
@@ -184,10 +188,30 @@ class WindowImpl : public WindowBaseImpl, public IAvnWindow
         UpdateStyle();
     }
     
+    
+    virtual HRESULT SetCanResize(bool value)
+    {
+        _canResize = value;
+        UpdateStyle();
+        return S_OK;
+    }
+    
+    virtual HRESULT SetHasDecorations(bool value)
+    {
+        _hasDecorations = value;
+        UpdateStyle();
+        return S_OK;
+    }
+    
 protected:
     virtual NSWindowStyleMask GetStyle()
     {
-        return NSWindowStyleMaskBorderless | NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskMiniaturizable | NSWindowStyleMaskResizable;
+        unsigned long s = NSWindowStyleMaskBorderless;
+        if(_hasDecorations)
+            s = s | NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskMiniaturizable;
+        if(_canResize)
+            s = s | NSWindowStyleMaskResizable;
+        return s;
     }
 };
 
diff --git a/src/Avalonia.Native/WindowImpl.cs b/src/Avalonia.Native/WindowImpl.cs
index 92690e4370..484fe3d514 100644
--- a/src/Avalonia.Native/WindowImpl.cs
+++ b/src/Avalonia.Native/WindowImpl.cs
@@ -7,10 +7,11 @@ namespace Avalonia.Native
 {
     class WindowImpl : WindowBaseImpl, IWindowImpl
     {
+        IAvnWindow _native;
         public WindowImpl(IAvaloniaNativeFactory factory)
         {
             using (var e = new WindowEvents(this))
-                Init(factory.CreateWindow(e));
+                Init(_native = factory.CreateWindow(e));
         }
 
         class WindowEvents : WindowBaseEvents, IAvnWindowEvents
@@ -31,10 +32,12 @@ namespace Avalonia.Native
 
         public void CanResize(bool value)
         {
-
+            _native.CanResize = value;
         }
+
         public void SetSystemDecorations(bool enabled)
         {
+            _native.HasDecorations = enabled;
         }
 
         public void SetTitle(string title)
diff --git a/src/headers/avalonia-native.h b/src/headers/avalonia-native.h
index 9f5e3faa7e..2653e32864 100644
--- a/src/headers/avalonia-native.h
+++ b/src/headers/avalonia-native.h
@@ -37,7 +37,8 @@ AVNCOM(IAvnWindowBase, 02) : virtual IUnknown
 
 AVNCOM(IAvnWindow, 03) : virtual IAvnWindowBase
 {
-    
+    virtual HRESULT SetCanResize(bool value) = 0;
+    virtual HRESULT SetHasDecorations(bool value) = 0;
 };
 
 AVNCOM(IAvnWindowBaseEvents, 04) : IUnknown