[WPF] Resolves a problem with ContextMenu binding commandparameter in a template

Directly on the code, the first is a ContextMenu template:

<ContextMenux:key= "Menu"borderthickness= "0.3"FontSize= "+"DataContext="{Binding placementtarget.tag, Relativesource={relativesource self}}">        <MenuItemHeader= "Copy"Command="{Binding source={x:static Vm:viewmodellocator.instance},path=mainwindowvm.copyimagecommand}"CommandParameter="{Binding placementtarget.datacontext, Relativesource={relativesource Ancestortype=contextmenu}}"Commandtarget="{Binding placementtarget, Relativesource={relativesource self}}" />        <MenuItemHeader= "Save As ..."Command="{Binding source={x:static Vm:viewmodellocator.instance},path=mainwindowvm.saveimagecommand}"CommandParameter="{Binding placementtarget.datacontext, Relativesource={relativesource Ancestortype=contextmenu}}"Commandtarget="{Binding placementtarget, Relativesource={relativesource self}}" />    </ContextMenu>

Then there is the content of DataTemplate:

<DataTemplatex:key= "Customerimagedatatemplate">            <ButtonCommand="{Binding Datacontext.showimagecommand, Relativesource={relativesource FindAncestor, Ancestortype=window}}"Cursor= "Hand"CommandParameter="{Binding path=datacontext, Relativesource={relativesource mode=findancestor, ancestorlevel=1,ancestortype= StackPanel}}"Padding= "3">                <button.template>                    <ControlTemplateTargetType= "button">                        <Grid>                            <BorderName= "Imgborder"BorderBrush="{StaticResource Listborder}"Cornerradius= "3"borderthickness= "0"Background="{dynamicresource {x:static Systemcolors.windowbrushkey}}"Margin= "0">                            </Border>                            <Imagex:name= "Imagemsg"Source="{Binding Textcontent}"Stretch= "Uniform"Width= "+"Height= "a"ContextMenu="{StaticResource Menu}"Tag="{Binding}">                                <Image.opacitymask>                                    <VisualBrushVisual="{Binding elementname=imgborder, mode=onetime}" />                                </Image.opacitymask>                            </Image>                        </Grid>                    </ControlTemplate>                </button.template>            </Button>    </DataTemplate>

The button above also shows how to set the corners of the picture to rounded corners.

[WPF] Resolves a problem with ContextMenu binding commandparameter in a template