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

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

# ComboBoxSelectedItemChangedEventArgs.ComboBox

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

## ComboBox

The ComboBox that it is selected item changed

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

- CLI: Never raised in the CLI: the events that pass it never fire there (ComboBox.SelectedItemChanged).
- Cloud: Never raised in the cloud: the events that pass it never fire there (ComboBox.SelectedItemChanged).

C#:

```csharp
public ComboBox ComboBox {get;}
```

Python:

```python
comboBoxSelectedItemChangedEventArgs.ComboBox: ComboBox
```

### Returns

`ComboBox` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    var comboBox = new ComboBox();
    comboBox.AddItem("Hour");
    comboBox.AddItem("Daily");
    comboBox.SelectedItemChanged += OnComboBoxSelectedItemChanged;
    Chart.AddControl(comboBox);
}

private void OnComboBoxSelectedItemChanged(ComboBoxSelectedItemChangedEventArgs args)
{
    Print("Combo box selected index: {0}", args.ComboBox.SelectedIndex);
}
```

Python:

```python
def on_start(self):
    comboBox = ComboBox()
    comboBox.AddItem("Hour")
    comboBox.AddItem("Daily")
    comboBox.SelectedItemChanged += self.on_combo_box_selected_item_changed
    api.Chart.AddControl(comboBox)

def on_combo_box_selected_item_changed(self, args):
    api.Print(f"Combo box selected index: {args.ComboBox.SelectedIndex}")
```