--- a/api/cpp/platform.rs
+++ b/api/cpp/platform.rs
@@ -98,6 +98,8 @@
     }
 
     fn update_window_properties(&self, properties: WindowProperties<'_>) {
+        #[cfg(target_env = "ohos")]
+        harmony_services::window_chrome(self);
         unsafe { (self.update_window_properties)(self.user_data, &properties) }
     }
 }
@@ -206,6 +208,16 @@
     pub extern "C" fn crossdesk_slint_set_os_callback(callback: HarmonyOsCallback) {
         CALLBACK.set(Some(callback));
     }
+    // Read these properties inside the normal property tracker so subsequent
+    // Slint changes propagate without a separate UI/window state machine.
+    pub(super) fn window_chrome(adapter: &CppWindowAdapter) {
+        let Some(callback) = CALLBACK.get() else { return };
+        let Some(item) = WindowInner::from_pub(&adapter.window).window_item() else { return };
+        let item = item.as_pin_ref();
+        let flags = i32::from(item.no_frame()) | (i32::from(item.always_on_top()) << 1);
+        unsafe { callback(adapter.user_data, adapter as *const _ as *const c_void, 4,
+            core::ptr::null(), 0, 0, 0, 0., 0., 0., 0., flags); }
+    }
     impl WindowAdapterInternal for CppWindowAdapter {
         fn input_method_request(&self, request: InputMethodRequest) {
             let Some(callback) = CALLBACK.get() else { return };