Binding UserControl Command to MainWindow WPF/MVVM

Question

I have a UserControl which is just a simple DataGrid to show some stuff, it has his own ViewModel and Model.

I would like to whenever I click on the DataGrid, raise an Event. So far, it's working with commands, and I get the event on my UserControl.ViewModel.

The thing is that I need the event to be raise in the MainWindow.ViewModel, which is who contains the logic to load the stuff needed in the UserControl.DataGrid.

In my little understanding in WPF and MVVM, I have the following options:

• DependencyProperty of the UserControl.DataGridClicked (which I would like to avoid, and stick as possible to MVVM)
• Give the MainWindow.ViewModel instance to the constructor of my UserControl.ViewModel, so I can raise the event directly.
• Create a BusinessLogic Class, and put the logic there, so I can call it on UserControl.ViewModel or MainWindow.ViewModel.
• ?

This is how I call my UserControl:

<Window>
    <Grid>
        <TabControl>
            <TabItem Header="{Binding Model.TabImportHeader}">
                <views:ResultView DataContext="{Binding ResultViewModel}"/>
            </TabItem>
        </TabControl>
    </Grid>
</Window>

And this is my UserControl:

<UserControl x:Class="ResultView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:viewModels="clr-namespace:ViewModels"
             mc:Ignorable="d"
             d:DataContext="{d:DesignInstance Type=viewModels:ResultViewModel, IsDesignTimeCreatable=False}">

    <!--DataGrid-->
    <DataGrid ItemsSource="{Binding Model.ObservableCollection}"
              ColumnWidth="*"
              AutoGenerateColumns="false"
              IsReadOnly="True"
              BorderThickness="0"
              Background="White"
              HeadersVisibility="Column">

        <!--InputBindings-->
        <DataGrid.InputBindings>
            <MouseBinding Gesture="LeftClick"
                          Command="{Binding LeftClickCommand}">

            </MouseBinding>
        </DataGrid.InputBindings>
        <!--InputBindings-->

        <DataGrid.Columns>
            <DataGridTextColumn Header="Filename"
                                Binding="{Binding FileInfo.Name}"
                                Width="Auto" />
        </DataGrid.Columns>
    </DataGrid>
</UserControl>

Any WPF Master who also knows a little about good practices? I will really appreciate any help.

Thanks in advance.

EDIT: Command declaration:

public ICommand = new RelayCommand(LeftClick, () => true);