# Sandbox.UI.BaseVirtualPanel.NeedsRebuild

```csharp
bool NeedsRebuild { get; set; }
```

When true, forces a layout rebuild on the next [Sandbox.UI.BaseVirtualPanel.Tick](/api/Sandbox.UI.BaseVirtualPanel/Tick).

Declared in [Sandbox.UI.BaseVirtualPanel](/api/Sandbox.UI.BaseVirtualPanel).
Assembly: `Sandbox.Engine`.