# Sandbox.UI.MousePanelEvent.KeyboardModifiers

```csharp
KeyboardModifiers KeyboardModifiers { get; set; }
```

The modifier keys held down when this happened - so a click can tell shift+click from
a plain one.

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