WPF DataGrid Binding with Context Menu argument

Question

I have a ContextMenu inside DataGrid, I need to pass the selected items, selected cells as an argument to my Delegate comments. When i try with the following code. i am getting an BindingError as "Cannot find source for binding with reference 'ElementName=m_dsGrid'. BindingExpression:Path=SelectedItems.Cells; DataItem=null; target element is 'MenuItem' (Name=''); target property is 'CommandParameter' (type 'Object')"

 

<dp:XamDataGrid DataSource="{Binding CustomerCollection}" IsSynchronizedWithCurrentItem="True" GroupByAreaLocation="None"

ActiveDataItem="{Binding SelectedCustomer, UpdateSourceTrigger=PropertyChanged, Source=.}">

<dp:XamDataGrid.FieldLayoutSettings>

<dp:FieldLayoutSettings AutoGenerateFields="False" SelectionTypeRecord="Single" AllowFieldMoving="No" AllowRecordFixing="No" RecordSelectorLocation="None"/>

</dp:XamDataGrid.FieldLayoutSettings>

<dp:XamDataGrid.FieldSettings>

<dp:FieldSettings AllowResize="False" CellClickAction="SelectRecord" LabelTextAlignment="Center" AllowEdit="False"/>

</dp:XamDataGrid.FieldSettings>

<dp:XamDataGrid.FieldLayouts>

<dp:FieldLayout Key="Details">

<dp:FieldLayout.Fields>

<dp:UnboundField Label="No" BindingPath="Number" Width="80"/>

<dp:UnboundField Label="Name" BindingPath="Name" Width="80"/>

<dp:UnboundField Label="Place" BindingPath="Place" Width="80"/>

</dp:FieldLayout.Fields>

</dp:FieldLayout>

</dp:XamDataGrid.FieldLayouts>

<dp:XamDataGrid.ContextMenu>

<ContextMenu>

<MenuItem Header="Copy">

<MenuItem Header="Copy selected cells" Command="{Binding Path=CopySelectedCellsCommand}" CommandParameter="{Binding ElementName=m_dsGrid, Path=SelectedItems.Cells}" ToolTip="Reload current column layout from database.">

</MenuItem>

</ContextMenu>

</dp:XamDataGrid.ContextMenu>

</dp:XamDataGrid>