---
id: "E:cAlgo.API.ToggleButton.Checked"
kind: "event"
type: "T:cAlgo.API.ToggleButton"
url: "https://help.ctrader.com/ctrader-algo/references/Controls/ToggleButton/Checked/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# ToggleButton.Checked

Member of [ToggleButton](https://help.ctrader.com/ctrader-algo/references/Controls/ToggleButton/index.md).

## Checked

Occurs when checked.

Environments: Desktop supported · CLI not supported · Cloud not supported.

- CLI: Accepted without error but never displayed, so control events such as Click are never raised.
- Cloud: Accepted without error but never displayed, so control events such as Click are never raised.

C#:

```csharp
public event Action<ToggleButtonEventArgs> Checked;
```

Python:

```python
toggleButton.Checked += handler  # handler(obj: ToggleButtonEventArgs)
```

### Returns

`Action<ToggleButtonEventArgs>` — 

### Examples

C#:

```csharp
var toggleButton = new ToggleButton { Text = "Show SMA" };
toggleButton.Checked += args => Print("SMA shown, value: {0}", Indicators.SimpleMovingAverage(Bars.ClosePrices, 14).Result.LastValue);
Chart.AddControl(toggleButton);
```

Python:

```python
def on_start(self):
    toggleButton = ToggleButton()
    toggleButton.Text = "Show SMA"
    toggleButton.Checked += self.on_toggle_button_checked
    api.Chart.AddControl(toggleButton)

def on_toggle_button_checked(self, args):
    sma = api.Indicators.SimpleMovingAverage(api.Bars.ClosePrices, 14)
    api.Print(f"SMA shown, value: {sma.Result.LastValue}")
```