Using Caliburn.Micro cal:Message.Attach does a No target found for method - menuitem

Question

I have created dynamic MenuItems with the last recent open folders. This works well.
Now, beacause these MenuItems are created dynamically, when I click on one MenutItem, I would like to raise an action and give the header of the MenuItem as a parameter.
So this is my "MainView.xaml"
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase"
xmlns:common="clr-namespace:Common;assembly=RecentFileListLib"
xmlns:cal="http://www.caliburnproject.org"
xmlns:self="clr-namespace:MainUI.Models"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:ViewModels="clr-namespace:MainUI.ViewModels" xmlns:local="clr-namespace:MainUI.Views" x:Name="window" x:Class="MainUI.Views.MainView"
mc:Ignorable="d"
Title="MainView" Height="450" Width="800">
<Window.Resources>
<self:DebugDummyConverter x:Key="DebugDummyConverter" />
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="20"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="20"/>
</Grid.RowDefinitions>
<Menu Grid.Row="0" Grid.Column="1" Grid.ColumnSpan="4" Margin="0">
<MenuItem x:Name="menuItem" Header="_File">
<MenuItem Header="_Open" x:Name="FileOpen"/>
<MenuItem x:Name="RecentProject" Header="Recents Projects" >
<MenuItem.ItemTemplate >
<DataTemplate >
<MenuItem Header="{Binding DisplayPath, Converter={StaticResource DebugDummyConverter}}" cal:Message.Attach="Remove($dataContext)"/>
</DataTemplate>
</MenuItem.ItemTemplate>
</MenuItem>
</MenuItem>
</Menu>
<StackPanel Orientation="Vertical" Grid.Row="2" Grid.Column="1" Grid.RowSpan="1" Margin=" 0 0 10 0" >
<Button x:Name="LoadUser" Content="Load User Page" />
</StackPanel>
<ContentControl Grid.Row="1" Grid.Column="2" Grid.ColumnSpan="1" Grid.RowSpan="2" x:Name="ActiveItem"/>
<StatusBar Grid.Row="4" Grid.Column="1" Grid.ColumnSpan="2">
<StatusBar.ItemsPanel>
<ItemsPanelTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="100" />
</Grid.ColumnDefinitions>
</Grid>
</ItemsPanelTemplate>
</StatusBar.ItemsPanel>
<StatusBarItem Grid.Column="1">
<TextBlock Text="{Binding FolderPath}" />
</StatusBarItem>
</StatusBar>
</Grid>
For this I'm using cal:Message.Attach="Remove($dataContext)
And in my view model "MainViewModel"
public partial class MainViewModel : Conductor<Object>
{
public BindableCollection<RecentFile> RecentProject { get; private set; } = new BindableCollection<RecentFile>();
public string FolderPath { get; set; }
public MainViewModel()
{
Persister = new RegistryPersister();
MaxNumberOfFiles = 9;
MaxPathLength = 50;
MenuItemFormatOneToNine = "_{0}: {2}";
MenuItemFormatTenPlus = "{0}: {2}";
RemoveMenuItems();
LoadRecentFiles();
}
public void Remove(Object child)
{
}
By doing it like this, when I click on my menuitem I have a message "No target found for method Remove."
If someone can help me.
Thanks in advance

Answer 1

You could make use of cal:Action:TargetWithoutContext. For example,
cal:Action.TargetWithoutContext="{Binding ElementName=RecentProject, Path=DataContext}"
Complete Code
<MenuItem x:Name="RecentProject" Header="Recents Projects" Tag="{Binding}">
<MenuItem.ItemTemplate >
<DataTemplate >
<MenuItem Header="{Binding DisplayPath}" cal:Message.Attach="Remove($dataContext)" cal:Action.TargetWithoutContext="{Binding ElementName=RecentProject, Path=DataContext}"/>
</DataTemplate>
</MenuItem.ItemTemplate>
</MenuItem>