Return false instead of true on OnBeforeUserUpdate so we don't hang here.

sample/PGEX_SMX.h

@@ -84,7 +84,7 @@ private:
             internal_panelState[i].bPressed=false;
             internal_panelState[i].bReleased=false;
         }
-        return true;
+        return false;
     }
 
     virtual void OnAfterUserUpdate(float fElapsedTime)override{