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

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

# ComboBox.SelectedItemChanged

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

## SelectedItemChanged

This event will trigger if the ComboBox selected item changed

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<ComboBoxSelectedItemChangedEventArgs> SelectedItemChanged;
```

Python:

```python
comboBox.SelectedItemChanged += handler  # handler(obj: ComboBoxSelectedItemChangedEventArgs)
```

### Returns

`Action<ComboBoxSelectedItemChangedEventArgs>` — 

### Examples

C#:

```csharp
var comboBox = new ComboBox();
comboBox.AddItem("EURUSD");
comboBox.AddItem("GBPUSD");
comboBox.SelectedItemChanged += args => Print("Selected symbol: {0}", args.SelectedItem);
Chart.AddControl(comboBox);
```

Python:

```python
def on_start(self):
    comboBox = ComboBox()
    comboBox.AddItem("EURUSD")
    comboBox.AddItem("GBPUSD")
    comboBox.SelectedItemChanged += self.on_selected_item_changed
    api.Chart.AddControl(comboBox)

def on_selected_item_changed(self, args):
    api.Print(f"Selected symbol: {args.SelectedItem}")
```