# Editor.PanelWindow.Popup

```csharp
static PanelWindow Popup(PanelWindow parent, Vector2 position, Vector2 size)
```

Open a popup - a borderless window that sits above its parent and can hang outside it, the
way an OS menu does. The position is in the parent's client pixels.

### Parameters

- `parent` (`PanelWindow`)
- `position` (`Vector2`)
- `size` (`Vector2`)

### Returns

`PanelWindow`

Declared in [Editor.PanelWindow](/api/Editor.PanelWindow).
Assembly: `Sandbox.Tools`.