How to realize Command in MVVMLight?

Jul 3, 2014 at 3:28 AM
Edited Jul 3, 2014 at 3:30 AM
                <dxg:GridColumn x:Name="hdrsStatusYNName" Header="Status" FieldName="StatusYN" HorizontalHeaderContentAlignment="Center">
                    <dxg:GridColumn.HeaderTemplate>
                        <DataTemplate>
                            <ContentControl Content="{Binding}" TextBlock.FontWeight="Bold"/>
                        </DataTemplate>
                    </dxg:GridColumn.HeaderTemplate>
                    <dxg:GridColumn.CellTemplate>
                        <DataTemplate>
                            <dxe:ComboBoxEdit EditValue="{Binding Data.StatusYN,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" IsTextEditable="False" >
                                <dxe:ComboBoxEditItem x:Name="readyCombox" PreviewMouseDown="Combox_PreviewMouseDown" Content="Ready For Vantage">
                                    <i:Interaction.Triggers>
                                        <i:EventTrigger EventName="PreviewMouseDown">
                                            <cmd:EventToCommand 
                                            Command="{Binding Path=DataContext.ImportHistoryCommand, ElementName=craneDataBrowseDXGrid}"
                                            CommandParameter="{Binding Path=FocusedRow,ElementName=craneDataBrowseTableView}"/>
                                        </i:EventTrigger>
                                    </i:Interaction.Triggers>

                                </dxe:ComboBoxEditItem>
                            </dxe:ComboBoxEdit>
                        </DataTemplate>
                    </dxg:GridColumn.CellTemplate>
                </dxg:GridColumn>
craneDataBrowseDXGrid is a DevExpress GridControl

Command is nerver trigged. How to trigger Command in DevExpress GridControl?