# sendMessageToCustomTile()

Posts a message to the iframe of the custom tile which was previously created with [addCustomTile()](/reference/sdk/methods/addcustomtile.md).

It is mainly used if you have listeners in your custom tile and want to inform your iframe.

{% hint style="warning" %}
The method must be called after you have add the custom tile. It won't do anything if there isn't an existing tile with a matching name.
{% endhint %}

{% hint style="info" %}
This method is often used in conjunction with the [addCustomTile()](/reference/sdk/methods/addcustomtile.md) and [removeCustomTile()](/reference/sdk/methods/removecustomtile.md) methods.
{% endhint %}

In the below example a custom AI tile is added to the stage and then a message send to it.

```javascript
sambaFrame.on('userJoined', (event) => {
   const data = event.data;
   if (data.type === 'local') {
     sambaFrame.addCustomTile({
        "name": "AI", 
        "html": '<iframe src="url to your customm site with a listener inside"></iframe>',
        "position": "last"
     });
     
     .....................
     
     //At some point later
     sambaFrame.sendMessageToCustomTile({
     
        //Identifier and title of your custom tile. Must match the name in addCustomTile
        "name": "AI",
        
        //A custom event name which your tile knows about
        "event": "muteInternally",
         
        /*
          The target origin for postMessage
          https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage
        */
        "origin": "*" ,
        
        //Some custom payload data if you need        
        "data": {
          "everything": true/false
        }
     });
   }
});
```

```javascript
//Somewhere in your embedded iframe custom site
<script>
  window.addEventListener("message", (event) => {
    console.log(event.data);
    alert(JSON.stringify(event.data));
  }, false);
</script>
```


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