---
id: "T:cAlgo.API.TabControlSelectedTabChangedEventArgs"
kind: "class"
namespace: "cAlgo.API"
url: "https://help.ctrader.com/ctrader-algo/references/EventArgs/TabControlSelectedTabChangedEventArgs/"
---

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

# TabControlSelectedTabChangedEventArgs (class)

Provides data for the TabControl SelectedTabChanged event.

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

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

## Definition

```csharp
public class TabControlSelectedTabChangedEventArgs
```

Available since cAlgo.API 5.2.

## Examples

C#:

```csharp
protected override void OnStart()
{
    var tabControl = new TabControl();
    tabControl.AddTab(new TabItem { Header = new TextBlock { Text = "Positions" }, Content = new TextBlock { Text = "Open positions" } });
    tabControl.AddTab(new TabItem { Header = new TextBlock { Text = "Orders" }, Content = new TextBlock { Text = "Pending orders" } });
    tabControl.SelectedTabChanged += OnSelectedTabChanged;
    Chart.AddControl(tabControl);
}

private void OnSelectedTabChanged(TabControlSelectedTabChangedEventArgs args)
{
    var header = args.SelectedTab?.Header as TextBlock;
    Print("Selected tab: {0} of {1}", header?.Text, args.TabControl.Tabs.Count);
}
```

Python:

```python
def on_start(self):
    tabControl = TabControl()
    for title in ["Positions", "Orders"]:
        header = TextBlock()
        header.Text = title
        tab = TabItem()
        tab.Header = header
        tabControl.AddTab(tab)
    tabControl.SelectedTabChanged += self.on_selected_tab_changed
    api.Chart.AddControl(tabControl)

def on_selected_tab_changed(self, args):
    api.Print(f"Selected tab: {args.SelectedTab.Header.Text} of {args.TabControl.Tabs.Count}")
```

## Properties

- `public TabItem SelectedTab {get;}` — Gets selected tab item. [details](https://help.ctrader.com/ctrader-algo/references/EventArgs/TabControlSelectedTabChangedEventArgs/SelectedTab/index.md)
- `public TabControl TabControl {get;}` — Gets tab control. [details](https://help.ctrader.com/ctrader-algo/references/EventArgs/TabControlSelectedTabChangedEventArgs/TabControl/index.md)