Memory leak with Interaction Triggers in MVVM Light Toolkit Silverlight - memory-leaks

Question

Visual Studio 2012 Project with memory leak
Hello!
I've found a memory leak when using Interaction Triggers in the MVVM Light Toolkit.
I use this xaml
<UserControl x:Class="MemoryLeakTest.MainPage"
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:ignore="http://www.ignore.com"
mc:Ignorable="d ignore"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:mvvm="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.SL5"
x:Name="control"
DataContext="{Binding Main, Source={StaticResource Locator}}">
<Grid x:Name="LayoutRoot">
<ItemsControl ItemsSource="{Binding LeakObjects}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Border Width="300" BorderThickness="6" BorderBrush="BlueViolet" CornerRadius="3">
<Grid Background="{Binding ColorBrush}" >
<StackPanel>
<Button Command="{Binding ElementName=control, Path=DataContext.Command}" Width="100" Height="40" Content="Tryck!">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<mvvm:EventToCommand Command="{Binding ElementName=control, Path=DataContext.Command}" CommandParameter="{Binding}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
<TextBlock Text="{Binding Text}"/>
</StackPanel>
</Grid>
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
and then i rebind the list LeakObjects so that it creates new items.
The old items (xaml) like buttons and text blocks are still in memory and doesn't GC.
If I write
<Button Command="{Binding ElementName=control, Path=DataContext.Command}" Width="100" Height="40" Content="Press!"/>
and use the buttons Command parameter there is no memory leak but if I use the
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<mvvm:EventToCommand Command="{Binding ElementName=control, Path=DataContext.Command}" CommandParameter="{Binding}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
there is a major leak.
The problem is that there are no Command parameters on grids etc.
The project in the link has this very simple project demonstrating the problem.
Is there a way to circumvent the memory leak? Maybe I'm using it wrong.
It is crucial that I find a way to fix this because this memory leak is all over our application.

Answer 1

I've experienced this leak as well. I've solved it by not using the EventToCommands and rather using just plain event handlers and calling the commands from these methods in page code-behind. It's not that clean, but it works and the page is Garbage Collected as expected.
Or you could use InvokeCommandAction instead, works for me.
http://www.dotnetpatterns.net/entries/21-Memory-Leak-issue-with-EventToCommand-passing-binding-to-RelayCommand