I have a XamDataTree, which i need to bind a command to.  I am using MVVM.  In the ViewModel is the ShowReportCommand.  How do i set this up so it works, without the binding error i currently have:

<igDT:XamDataTree Name="Reports" ItemsSource="{Binding ReportList}" NodeLineVisibility="Visible" 
                                                  Height="Auto" MaxHeight="300" BorderThickness="0"
                                                  Width="Auto" MaxWidth="{Binding ElementName=ReportsExpander, Path=ActualWidth, Converter={StaticResource WidthMinusScrollConverter}}" >
                                    <igDT:XamDataTree.GlobalNodeLayouts>
                                        <igDT:NodeLayout Key="ReportFolder" TargetTypeName="ReportFolder" DisplayMemberPath="FolderName" />
                                        <igDT:NodeLayout Key="Report" TargetTypeName="Report" DisplayMemberPath="DisplayName">
                                            <igDT:NodeLayout.ItemTemplate>
                                                <DataTemplate>
                                                    <Button Style="{StaticResource LinkButton}" 
                                                            Command="{Binding ShowReportCommand}"
                                                            CommandParameter="{Binding}" >
                                                        <StackPanel Orientation="Horizontal" >
                                                            <Image Source="/Resources/Icons/report.png"/>
                                                            <TextBlock Text="{Binding Data.DisplayName}" Style="{StaticResource MenuTB}" />
                                                        </StackPanel>
                                                    </Button>
                                                </DataTemplate>
                                            </igDT:NodeLayout.ItemTemplate>
                                        </igDT:NodeLayout>
                                    </igDT:XamDataTree.GlobalNodeLayouts>
                                </igDT:XamDataTree>