diff --git a/src/components/ShareButton.tsx b/src/components/ShareButton.tsx
index bea6fe3..5a5d648 100644
--- a/src/components/ShareButton.tsx
+++ b/src/components/ShareButton.tsx
@@ -70,9 +70,27 @@ export function ShareButton({ variant = 'default', autoOpen, onHandleChange, onV
     streamRef.current = null;
     setHandle(null);
     setViewerCount(0);
+    onHandleChange?.(null);
+    onViewerCountChange?.(0);
     toast.info('Transmissão encerrada');
   };
 
+  // Auto-open dialog when requested by parent (in-XR HUD)
+  useEffect(() => {
+    if (autoOpen) setOpen(true);
+  }, [autoOpen]);
+
+  // Expose start/stop via window so XR HUD can trigger from inside the scene
+  useEffect(() => {
+    (window as unknown as { __trackSteelStartLive?: () => void; __trackSteelStopLive?: () => void }).__trackSteelStartLive = () => { if (!handle) start(); };
+    (window as unknown as { __trackSteelStopLive?: () => void }).__trackSteelStopLive = () => { if (handle) stop(); };
+    return () => {
+      delete (window as unknown as { __trackSteelStartLive?: () => void }).__trackSteelStartLive;
+      delete (window as unknown as { __trackSteelStopLive?: () => void }).__trackSteelStopLive;
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [handle]);
+
   // Cleanup on unmount
   useEffect(() => {
     return () => {