---
id: "P:cAlgo.API.ChartMouseEventArgs.CtrlKey"
kind: "property"
type: "T:cAlgo.API.ChartMouseEventArgs"
url: "https://help.ctrader.com/ctrader-algo/references/EventArgs/ChartMouseEventArgs/CtrlKey/"
---

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

# ChartMouseEventArgs.CtrlKey

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

## CtrlKey

Defines whether the Ctrl key is pressed during the mouse event.

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

- CLI: Never raised in the CLI: the events that pass it never fire there (ChartArea.MouseDown, ChartArea.MouseEnter, ChartArea.MouseLeave and more).
- Cloud: Never raised in the cloud: the events that pass it never fire there (ChartArea.MouseDown, ChartArea.MouseEnter, ChartArea.MouseLeave and more).

C#:

```csharp
public bool CtrlKey {get;}
```

Python:

```python
chartMouseEventArgs.CtrlKey: bool
```

### Returns

`bool` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    Chart.MouseDown += OnChartMouseDown;
}

private void OnChartMouseDown(ChartMouseEventArgs args)
{
    if (args.CtrlKey)
        PlaceLimitOrder(TradeType.Buy, SymbolName, 10000, args.YValue, "ctrlClick");
}
```

Python:

```python
def on_start(self):
    api.Chart.MouseDown += self.on_chart_mouse_down

def on_chart_mouse_down(self, args):
    if args.CtrlKey:
        api.PlaceLimitOrder(TradeType.Buy, api.SymbolName, 10000, args.YValue, "ctrlClick")
```