c# - Handling a Button's Click event in XAML?

Question

This feels like a terribly basic question but I am sure there is a better way to do this. I have a Button in my UI which selects a specific tab and fire a Command from the ViewModel

Here is the current code (which works fine):

XAML:

<Button Content="Button!" Click="OnButtonClick" Command="{Binding WhateverCommand}" />

Code behind:

private void OnButtonClick(object sender, RoutedEventArgs e)
{
     theTab.IsSelected = true;
}

Isn't there any cleaner, XAML-only way to do that UI operation? I was thinking about something like:

<Button Content="Button!" Click="OnButtonClick" Command="{Binding WhateverCommand}">
    <Button.Triggers>
        <EventTrigger RoutedEvent="Click">
            <Setter TargetName="theTab" Property="IsSelected" Value="True" />
        </EventTrigger>
    </Button.Trigger>
</Button>

But unfortunately it seems like the EventTrigger won't support a Click event. Why so? I am still sometimes confused with triggers after a few years working in WPF, and this pretty much sums it up. When trying to build that I have an error on the Setter line:

A value of type 'Setter' cannot be added to a collection or dictionary of type 'TriggerActionCollection'.

Thank you!

EDIT since I was ask the XAML structure of my Window, it looks like this:

<DockPanel LastChildFill="True">
    <Ribbon DockPanel.Dock="Top">
        <Button Content="Button!" Click="OnButtonClick" Command="{Binding WhateverCommand}" />
    </Ribbon>
    <TabControl>
        <TabItem x:Name="theTab" />
    </TabControl>
</DockPanel>

Answer 1

Error sums it up. You cannot use Setter in EventTrigger. If you want to do it in XAML you can use Storyboard that will select given tab when button is pressed. Something like this:

<Button Content="Click">
   <Button.Triggers>
       <EventTrigger RoutedEvent="Button.Click">
           <BeginStoryboard>
               <Storyboard>
                   <BooleanAnimationUsingKeyFrames Storyboard.TargetName="theTab" Storyboard.TargetProperty="IsSelected">
                       <DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="True"/>
                   </BooleanAnimationUsingKeyFrames>
               </Storyboard>
           </BeginStoryboard>
       </EventTrigger>
   </Button.Triggers>
</Button>