Public Class ViewModel
    Inherits DependencyObject
    Private m_Collection As ObservableCollection(Of Item)
    Public Shared ReadOnly ItemsProperty As DependencyProperty = DependencyProperty.Register("Items", GetType(ObservableCollection(Of Item)), GetType(MainWindow), New PropertyMetadata(Nothing))
    Public Shared ReadOnly DeleteCommandProperty As DependencyProperty = DependencyProperty.Register("DeleteCommand", GetType(ICommand), GetType(MainWindow), New PropertyMetadata(Nothing))

    Public Property Items() As ObservableCollection(Of Item)
        Get
            Return DirectCast(GetValue(ItemsProperty), ObservableCollection(Of Item))
        End Get
        Set
            SetValue(ItemsProperty, Value)
        End Set
    End Property


    Public Property DeleteCommand() As ICommand
        Get
            Return DirectCast(GetValue(DeleteCommandProperty), ICommand)
        End Get
        Set
            SetValue(DeleteCommandProperty, Value)
        End Set
    End Property

    Sub New()
        Items = Item.GetItems()
        DeleteCommand = New MyCommand() With {.Collection = Items}
    End Sub

    Private Class MyCommand
        Implements ICommand
        Public Property Collection() As ObservableCollection(Of Item)
            Get
                Return m_Collection
            End Get
            Set
                m_Collection = Value
            End Set
        End Property
        Private m_Collection As ObservableCollection(Of Item)
        Public Event CanExecuteChanged As EventHandler
        Private Event ICommand_CanExecuteChanged As EventHandler Implements ICommand.CanExecuteChanged

        Private Function ICommand_CanExecute(parameter As Object) As Boolean Implements ICommand.CanExecute
            Return True
        End Function

        Private Sub ICommand_Execute(parameter As Object) Implements ICommand.Execute
            Collection.Remove(TryCast(parameter, Item))
        End Sub
    End Class
End Class

<Window x:Class="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:WPF_test"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources >
        <local:ViewModel x:Key="VM"/>
    </Window.Resources>

    <Grid>
        <DataGrid  DataContext="{Binding Source={StaticResource VM}}" x:Name="dgMain" AutoGenerateColumns="False" CanUserAddRows="False" Margin="5"
            SelectionMode="Extended" SelectionUnit="Cell"
            ItemsSource="{Binding Path=Items}">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Имя" Binding="{Binding Name}" Width="1*" />
                <DataGridTemplateColumn Header="Процент" Width="100">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Percent,StringFormat={}{0}%}" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                    <DataGridTemplateColumn.CellEditingTemplate>
                        <DataTemplate>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="1*" />
                                    <ColumnDefinition Width="auto" />
                                </Grid.ColumnDefinitions>
                                <TextBox Text="{Binding Percent,Mode=TwoWay}" />
                                <TextBlock Grid.Column="1" Text="%" />
                            </Grid>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellEditingTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Width="30">
                    <DataGridTemplateColumn.HeaderStyle>
                        <Style TargetType="{x:Type DataGridColumnHeader}" >
                            <Setter Property="Background" Value="White"></Setter>
                            <Setter Property="Foreground" Value="White"></Setter>
                            <Setter Property="BorderBrush" Value="White"></Setter>
                            <Setter Property="BorderThickness" Value="1"></Setter>
                        </Style>
                    </DataGridTemplateColumn.HeaderStyle>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button Content="Х" Command="{Binding Path=DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}" CommandParameter="{Binding}" />


                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
        
    </Grid>
</Window>

 Private Function ICommand_CanExecute

 <Button Content="Х" Command="{Binding Path=DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type  DataGrid }}}" CommandParameter="{Binding}" />

  <Button Content="Х" Command="{Binding Path=DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type  DataGridTemplateColumn }}}" CommandParameter="{Binding}" />

    <Window.DataContext >
        <local:ViewModel/>
    </Window.DataContext>
    

 <Button Content="Х" Command="{Binding Path=DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type  Window }}}" CommandParameter="{Binding}" />

<Button Content="Х" Command="{Binding Path=DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:ViewModel}}}" CommandParameter="{Binding}" />

    Public Shared ReadOnly DeleteCommandProperty As DependencyProperty = DependencyProperty.Register("DeleteCommand", GetType(ICommand), GetType(MainWindow), New PropertyMetadata(Nothing))

    Public Shared ReadOnly DeleteCommandProperty As DependencyProperty = DependencyProperty.Register("DeleteCommand", GetType(ICommand), GetType(ViewModel), New PropertyMetadata(Nothing))