Tab control selecting first tab by default

c#, wpf

Solution

I just had the same issue. I Know this is an old question, but I thought I'd leave the answer here for future me.

Use the loaded event via the xaml:

<TabControl Loaded="SheetTabs_Loaded"></TabControl>

In the ".xaml.cs" create the method:

private void SheetTabs_Loaded(object sender, RoutedEventArgs e)
{
    var tabControl = (TabControl)sender;
    tabControl.SelectedIndex = 0;
}

Problem

I am not sure if this is just the default WPF tab control behaviour or if there is a way to disable it. I have a tab control defined as below: ``` <TabControl TabStripPlacement="Left" Background="Transparent" ItemsSource="{Binding Path=AvailableProducts}" SelectedValuePath="Name" SelectedValue="{Binding Path=SelectedProduct, Mode=TwoWay}"> ``` AvailableProducts is a list of products. For example: ``` Foo Bar Baz ``` Initially, SelectedProduct is null but when the tab control is displayed, it has automatically selected Foo. What I want is for no tab to be selected at all. Will the tab control always select the first tab? UPDATE I added some sample code that shows what I am describing. ``` <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <TabControl SelectedIndex="1"> <TabItem Header="TAB 1"> <Button>TEST</Button> </TabItem> <TabItem Header="TAB 2"> <TabControl TabStripPlacement="Left" Background="Transparent" ItemsSource="{Binding Path=AvailableProducts}" SelectedValuePath="Name" SelectedValue="{Binding Path=SelectedProduct, Mode=TwoWay}"/> </TabItem> </TabControl> </Grid> </Window> using System.Collections.Generic; namespace WpfApplication1 { public partial class MainWindow { private List<Product> _availableProducts = new List<Product>(); public MainWindow() { SelectedProduct = null; InitializeComponent(); _availableProducts.Add(new Product("Foo")); _availableProducts.Add(new Product("Bar")); _availableProducts.Add(new Product("Baz")); DataContext = this; } public List<Product> AvailableProducts { get { return _availableProducts; } } public string SelectedProduct { get; set; } } public class Product { public Product(string name) { Name = name; } public string Name { get; set; } public override string ToString() { return Name; } } } ``` If you run the code above, the app starts with "TAB 2" displayed and none of the tabs Foo/Bar/Baz are selected. However, if you change ``` <TabControl SelectedIndex="1"> ``` to ``` <TabControl SelectedIndex="0"> ``` and run the app, it starts on "TAB 1" and when you switch to "TAB 2", the first tab is selected (Foo). I don't understand why if you start on "TAB 2" it works as I expect but if you start on "TAB 1" and then switch to "TAB 2" a tab gets selected by default.

Original source