---
id: "M:cAlgo.API.ComboBox.#ctor"
kind: "constructor"
type: "T:cAlgo.API.ComboBox"
url: "https://help.ctrader.com/ctrader-algo/references/Controls/ComboBox/Constructor/"
---

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

# ComboBox constructor

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

## ComboBox()

Creates a new empty ComboBox with default ComboBox Style

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 ComboBox()
```

Python:

```python
ComboBox()
```

### Examples

C#:

```csharp
var comboBox = new ComboBox { Width = 120 };
foreach (var symbolName in new[] { "EURUSD", "GBPUSD", "USDJPY" })
    comboBox.AddItem(symbolName);
comboBox.SelectedIndex = 0;
Chart.AddControl(comboBox);
```

Python:

```python
comboBox = ComboBox()
comboBox.Width = 120
for symbolName in ["EURUSD", "GBPUSD", "USDJPY"]:
    comboBox.AddItem(symbolName)
comboBox.SelectedIndex = 0
api.Chart.AddControl(comboBox)
```