# Sandbox.UI.Panel.MarkRenderDirty

```csharp
void MarkRenderDirty()
```

> **Obsolete.** Drawing is regenerated every frame. This does nothing.

Does nothing. Drawing is regenerated on every command-list build, so there is no dirty state to mark.

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