How to bind to another function, inside a container with ItemsSource

Question

So I have this TabControl:

<Window
        x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1.ViewModel"
        mc:Ignorable="d"
        Title="Notepad-- - Octavian Niculescu" Height="450" Width="800">
    <Window.DataContext>
        <local:MainWindowViewModel/>
    </Window.DataContext>

    <!-- ... -->
    
            <TabControl SelectedIndex="{Binding SelectedTab}" ItemsSource="{Binding FileTabs}">
                <TabControl.ItemTemplate>
                    <DataTemplate>
                        <DockPanel>
                            <TextBlock Text="{Binding FileName}"/>
                            <Button 
                                BorderBrush="Transparent"
                                Background="Transparent"
                                Command=""
                                >X</Button>
                        </DockPanel>
                    </DataTemplate>
                </TabControl.ItemTemplate>

and FileTabs is of this type

public ObservableCollection<FileTabModel> FileTabs { get; set; }

Because I've used FileTabs as an ItemsSource, everything that I'm trying to bind inside this TabControl leads to FileTabModel fields.

In the Button, on the Command attribute, I don't want that. I want to bind to a function from my namespace (local:MainWindowViewModel), where I got FileTabs from.

Is there any way to do this?

If so, how?