New Post: WPF & Prism 4.1 Garbage Collection / Memory Issues

Finally found the root cause of my problem.... not exactly sure why it was messing things up though.

In our Shell.xaml we were binding "IsDefault" in one of our buttons to a PasswordBox's IsKeyboardFocused:

<Button Style="{DynamicResource RedSubmitButtonStyle}" IsDefault="{Binding ElementName=passwordBox1, Path=IsKeyboardFocused}" Command="{Binding LoginCommand}" Content="Login" Height="23" HorizontalAlignment="Left" Margin="145,86,0,0" Name="button1" VerticalAlignment="Top" Width="75" />

IsKeyboardFocused, is a dependency property according to MSDN

Perhaps its related to the PasswordBox attached property we're using to bind to the value entered into the PasswordBox - I found the code for that on another site.

Here's the full contents of our Shell.xaml file

<Grid x:Name="MainGrid" core:SharedResourceDictionary.MergedDictionaries="TabControlThemes;MenuThemes;ButtonThemes;DataGridThemes;TreeViewThemes;ComboBoxThemes;ListBoxThemes;GroupBoxThemes;ToggleSwitchThemes">
        
    <DockPanel>
        <ContentControl x:Name="menuContent" DockPanel.Dock="Top" prism:RegionManager.RegionName="MenuRegion" />
        <ContentControl DockPanel.Dock="Bottom" prism:RegionManager.RegionName="FooterRegion" />
        <ContentControl DockPanel.Dock="Top" prism:RegionManager.RegionName="MainContentRegion" />
    </DockPanel>

    <StackPanel Orientation="Horizontal" Panel.ZIndex="4" HorizontalAlignment="Right" VerticalAlignment="Top">
        <Button Visibility="{Binding IsFullScreenToggleVisible, Converter={StaticResource visConv}}" Command="{Binding ToggleFullScreen}" Height="50" Name="button4" Width="70" HorizontalAlignment="Right" Margin="0,10,10,0" VerticalAlignment="Top">
            <Button.Content>
                <TextBlock FontSize="12" FontWeight="Bold" TextWrapping="Wrap" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" Text=" Toggle Full Screen" />
            </Button.Content>
        </Button>

        <Button Visibility="{Binding IsAppCloseButtonVisible, Converter={StaticResource visConv}}" Command="{Binding ShutdownApplication}" Height="50" Name="button3" Width="50" HorizontalAlignment="Right" Margin="0,10,10,0" VerticalAlignment="Top">
            <Button.Content>
                <Image Source="..\Graphics\close.png" Name="image1" />
            </Button.Content>
        </Button>
    </StackPanel>

    <xctk:ChildWindow Name="loginChildWindow" Panel.ZIndex="3" CloseButtonVisibility="Collapsed" FocusedElement="{Binding ElementName=usernameTextBox}" WindowStartupLocation="Center" WindowState="{Binding IsVisible, Mode=TwoWay, Converter={StaticResource boolConverter}}" IsModal="True" OverlayOpacity="1" Caption="Pioneer Login" Height="164" Width="261">
        <xctk:ChildWindow.OverlayBrush>
            <ImageBrush Stretch="None" Viewport="0,0,46,29" ViewportUnits="Absolute" ImageSource="../Graphics/escheresque.png" TileMode="Tile" />
        </xctk:ChildWindow.OverlayBrush>
        <xctk:BusyIndicator IsBusy="{Binding IsLoginBusy}" BusyContent="Authenticating...">
            <Grid>
                <TextBox GotFocus="usernameTextBox_GotFocus" Text="{Binding Username, UpdateSourceTrigger=PropertyChanged}" Height="23" HorizontalAlignment="Left" Margin="99,20,0,0" Name="usernameTextBox" VerticalAlignment="Top" Width="120">
                    <TextBox.InputBindings>
                        <KeyBinding Key="Enter" Command="{Binding LoginCommand}" />
                    </TextBox.InputBindings>
                </TextBox>
                <Label Content="Username" Height="28" HorizontalAlignment="Left" Margin="28,18,0,0" Name="label1" VerticalAlignment="Top" />
                <Label Content="Password" Height="28" HorizontalAlignment="Left" Margin="29,47,0,0" Name="label2" VerticalAlignment="Top" />
                <PasswordBox attach:PasswordBoxAssistant.BindPassword="True" attach:PasswordBoxAssistant.BoundPassword="{Binding Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Height="23" HorizontalAlignment="Left" Margin="100,50,0,0" Name="passwordBox1" VerticalAlignment="Top" Width="120" />
                <Button Style="{DynamicResource RedSubmitButtonStyle}" IsDefault="{Binding ElementName=passwordBox1, Path=IsKeyboardFocused}" Command="{Binding LoginCommand}" Content="Login" Height="23" HorizontalAlignment="Left" Margin="145,86,0,0" Name="button1" VerticalAlignment="Top" Width="75" />
                <Button Style="{DynamicResource RedSubmitButtonStyle}" Command="{Binding LazyLoginCommand}" Visibility="{Binding IsDebugMode, Converter={StaticResource visConv}}" Content="Quick Login" Height="23" HorizontalAlignment="Left" Margin="23,87,0,0" Name="button2" VerticalAlignment="Top" Width="89" />
            </Grid>
        </xctk:BusyIndicator>
    </xctk:ChildWindow>

</Grid>