`So I am trying to use the DataGrid and create a Column Template to add a delete button. The problem is that the row is databound to a record that in my observableCollection, but the binding of the button has to be bound to the viewmodel and not to the object of the row. if a datacontext is added to the button, then the button will fire. However the SelectedValue for the Grid that is bound to a property ends up null if that is done.

Here is the code.

< DataGrid x: Name = "ActualDataGrid"  DockPanel.Dock = "Top"
   ItemsSource = "{Binding ActualData}"
   Margin = "5,10,5,5"
   FontSize = "14"
   FontWeight = "Bold"
   Background = "WhiteSmoke"
   AlternatingRowBackground = "AliceBlue"
   VerticalAlignment = "Top"
   HorizontalAlignment = "Stretch"
   AutoGenerateColumns = "False"
   GridLinesVisibility = "Horizontal"
   ColumnHeaderHeight = "45"
   SelectionMode = "Extended"
   CanUserAddRows = "True"
   CanUserDeleteRows = "False"
   SelectedValue = "{Binding SelectedResult}"
    Height = "{Binding ActualHeight, ElementName=ProjectedDataGrid}"
    VerticalScrollBarVisibility = "Visible" >
    <DataGrid.ColumnHeaderStyle >
      <Style TargetType = "DataGridColumnHeader" >
      <Setter Property = "ContentTemplate" >
      <Setter.Value >
      <DataTemplate >
      <TextBlock TextWrapping = "Wrap" Text = "{Binding}" FontWeight = "Bold" ></ TextBlock >
      </ DataTemplate >
      </ Setter.Value >
      </ Setter >
      </ Style >
    </ DataGrid.ColumnHeaderStyle >
    <DataGrid.Columns >
      < DataGridTextColumn Header = "Num" Width = "50" Binding = "{Binding Path= num}" />
      < DataGridTextColumn Header = "Notes" Width = "*" Binding = "{Binding Path= description}" />
      < DataGridTemplateColumn Header = "Delete" >
    <DataGridTemplateColumn.CellTemplate >
      <DataTemplate >
       <Button Command = "{Binding DeleteCommand}"
         Margin = "3" Background = "Transparent" BorderThickness = "0" >
       <Button.DataContext >    <=== Optional does not work because selected value nulled.
            <future:VmModel x:Name = "VM" />
        </ Button.DataContext >
      <Button.Content >
           <materialDesign:PackIcon Kind = "TrashCanOutline" VerticalAlignment="Center"/>
         </Button.Content>
       </Button>
    </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

DeleteCommand = new RelayCommand(param => CanDelete(param), param => Delete(param));

private bool CanDelete(object o)
{
    return true;// _selectedResult != null;
}

private ICommand _deleteCommand;
public ICommand DeleteCommand
{
   get
   {
      return _deleteCommand;
  }
  set
 { 
   _saveCommand = value;
  }
}

private void Delete(object result)
{
}
private FutureChartData _selectedResult;
public FutureChartData SelectedResult
{
    get { return _selectedResult; }
    set
    {
        _selectedResult = value;
        OnPropertyChanged("SelectedResult");
    }
}

 < Button Command = "{Binding DeleteCommand}"
  Margin = "3" Background = "Transparent" BorderThickness = "0" >
  < Button.DataContext >    <=== Optional does not work because selected value nulled.
      <future:VmModel x:Name = "VM" />
  </ Button.DataContext >
< Button.Content >
   < materialDesign:PackIcon Kind = "TrashCanOutline" VerticalAlignment="Center"/>
 </Button.Content>`
</Button>