We discovered a memory leak when attaching a KeyBinding to a PasswordBox and passing the PasswordBox as the CommandParameter. We could resolve this by moving the InputBinding up in the element hierarchy, however ideally this should not happen.

The XAML causing the leak

               <PasswordBox
                    x:Name="PasswordBox"
                    Width="300"
                    Margin="0,24,0,0"
                >
                    <PasswordBox.InputBindings>
                        <KeyBinding Key="Return" Command="{Binding SubmitPasswordCommand}" CommandParameter="{Binding ElementName=PasswordBox}" />
                    </PasswordBox.InputBindings>
                </PasswordBox>

The fix:

<StackPanel Margin="20" VerticalAlignment="Center">
                <StackPanel.InputBindings>
                    <KeyBinding Key="Return" Command="{Binding SubmitPasswordCommand}" CommandParameter="{Binding ElementName=PasswordBox}" />
                </StackPanel.InputBindings>
                <PasswordBox
                    x:Name="PasswordBox"
                    Width="300"
                    Margin="0,24,0,0"
                />
</StackPanel>

The memory leak report:

2026-03-31 10:05:12.1348|INFO|Noesis|: Noesis Shutdown 
2026-03-31 10:05:12.1377|INFO|Noesis|: -------------------------------------------------------- 
2026-03-31 10:05:12.1377|INFO|Noesis|:                   Alive Objects Report              
2026-03-31 10:05:12.1386|INFO|Noesis|: Class Name                                Instance Count 
2026-03-31 10:05:12.1386|INFO|Noesis|: -------------------------------------------------------- 
2026-03-31 10:05:12.1395|INFO|Noesis|: Setter                                                35 
2026-03-31 10:05:12.1395|INFO|Noesis|: DynamicResourceExpression                             26 
2026-03-31 10:05:12.1404|INFO|Noesis|: BaseSetterCollection                                  13 
2026-03-31 10:05:12.1404|INFO|Noesis|: SolidColorBrush                                       10 
2026-03-31 10:05:12.1404|INFO|Noesis|: BaseComponent                                         10 
2026-03-31 10:05:12.1417|INFO|Noesis|: Binding                                                9 
2026-03-31 10:05:12.1417|INFO|Noesis|: BindingExpression                                      9 
2026-03-31 10:05:12.1425|INFO|Noesis|: PropertyPath                                           8 
2026-03-31 10:05:12.1425|INFO|Noesis|: Trigger                                                8 
2026-03-31 10:05:12.1432|INFO|Noesis|: Style                                                  6 
2026-03-31 10:05:12.1432|INFO|Noesis|: TemplateBindingExpression                              5 
2026-03-31 10:05:12.1432|INFO|Noesis|: TemplateBinding                                        5 
2026-03-31 10:05:12.1444|INFO|Noesis|: Border                                                 4 
2026-03-31 10:05:12.1444|INFO|Noesis|: ControlTemplate                                        3 
2026-03-31 10:05:12.1454|INFO|Noesis|: BaseTriggerCollection                                  3 
2026-03-31 10:05:12.1454|INFO|Noesis|: Grid                                                   2 
2026-03-31 10:05:12.1454|INFO|Noesis|: Boxed<Bool>                                            2 
2026-03-31 10:05:12.1466|INFO|Noesis|: UIElementCollection                                    2 
2026-03-31 10:05:12.1466|INFO|Noesis|: Cursor                                                 2 
2026-03-31 10:05:12.1474|INFO|Noesis|: Boxed<VerticalAlignment>                               2 
2026-03-31 10:05:12.1474|INFO|Noesis|: RelativeSource                                         2 
2026-03-31 10:05:12.1483|INFO|Noesis|: Boxed<Visibility>                                      2 
2026-03-31 10:05:12.1483|INFO|Noesis|: Adorner                                                2 
2026-03-31 10:05:12.1483|INFO|Noesis|: Boxed<Single>                                          2 
2026-03-31 10:05:12.1495|INFO|Noesis|: TextBlock                                              1 
2026-03-31 10:05:12.1495|INFO|Noesis|: Boxed<UInt32>                                          1 
2026-03-31 10:05:12.1504|INFO|Noesis|: MeshData                                               1 
2026-03-31 10:05:12.1504|INFO|Noesis|: Image                                                  1 
2026-03-31 10:05:12.1504|INFO|Noesis|: TextBoxView                                            1 
2026-03-31 10:05:12.1516|INFO|Noesis|: Boxed<KeyboardNavigationMode>                          1 
2026-03-31 10:05:12.1516|INFO|Noesis|: BitmapImage                                            1 
2026-03-31 10:05:12.1524|INFO|Noesis|: KeyGesture                                             1 
2026-03-31 10:05:12.1524|INFO|Noesis|: PasswordBox                                            1 
2026-03-31 10:05:12.1533|INFO|Noesis|: InputBindingCollection                                 1 
2026-03-31 10:05:12.1533|INFO|Noesis|: BaseObject                                             1 
2026-03-31 10:05:12.1533|INFO|Noesis|: FontFamily                                             1 
2026-03-31 10:05:12.1545|INFO|Noesis|: ScrollViewer                                           1 
2026-03-31 10:05:12.1545|INFO|Noesis|: Boxed<HorizontalAlignment>                             1 
2026-03-31 10:05:12.1554|INFO|Noesis|: KeyBinding                                             1 
2026-03-31 10:05:12.1554|INFO|Noesis|: Boxed<Thickness>                                       1 
2026-03-31 10:05:12.1562|INFO|Noesis|: NameScope                                              1 
2026-03-31 10:05:12.1562|INFO|Noesis|: -------------------------------------------------------- 
2026-03-31 10:05:12.1573|WARN|Noesis|: Memory leaks detected: 53712 bytes