Thank you for your recent inquiry regarding UXContextMenu.

Could you please provide more information about your scenario? From the given snippet code, it seems that you are trying to attach the UXContextMenu control to UXGridView. As you may know, UXGridView already has their own built-in context menu. I’d like to suggest you to modify the built-in context menu of UXGrid for your required scenario.

can I simply use Command={Binding DoSomething}

The item container type of UXContextMenu is UXMenuItem. UXMenuItem implements both ICommandSource and INavigationSource to support commanding and navigation, which is shown in the following snippet code.

<Grid x:Name="LayoutRoot" Background="White" Intersoft:ContextMenuService.ContextMenu="{Binding ElementName=ContextMenu1}">
    <Grid.DataContext>
        <vm:MainPageViewModel />
    </Grid.DataContext>
    <Intersoft:UXContextMenu x:Name="ContextMenu1" HorizontalAlignment="Left" VerticalAlignment="Top">
        <Intersoft:UXMenuItem Header="Sort By">
            <Intersoft:UXMenuItem Header="Name" Command="{Binding SortCommand}" CommandParameter="Name"/>
            <Intersoft:UXMenuItem Header="Type" Command="{Binding SortCommand}" CommandParameter="Type"/>
            <Intersoft:UXMenuItem Header="Size" Command="{Binding SortCommand}" CommandParameter="Size"/>
        </Intersoft:UXMenuItem>
        <Intersoft:UXMenuItem Header="Properties"/>
        <Intersoft:UXMenuItem Header="About Us" NavigateUri="www.mywebsite.com" TargetName="_blank"/>
    </Intersoft:UXContextMenu>
</Grid>

You can do commanding through Command, CommandTarget, and CommandParameter properties and navigation.

Hope this helps.