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[`Workspace`](Workspace) › [on('window-open')](Workspace/on('window-open').md)
## Workspace.on('window-open') method
Triggered when a new popout window is created.
0.15.3
**Signature:**
```typescript
on(name: 'window-open', callback: (win: WorkspaceWindow, window: Window) => any, ctx?: any): EventRef;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| <code>name</code> | <code>'window-open'</code> | |
| <code>callback</code> | <code>(win: </code>[`WorkspaceWindow`](WorkspaceWindow)<code>, window: </code><code>Window</code><code>) => any</code> | |
| <code>ctx</code> | <code>any</code> | _(Optional)_ |
**Returns:**
[`EventRef`](EventRef)