Open context menu from Command crashes on rc1

In preview6 this worked, however with rc1 it crash the program:

Sample:

<Button
              IsEnabled="{Binding SlicerFile.CreatedThumbnailsCount}"
              ToolTip.Tip="Save properties to a file or clipboard"
              Command="{Binding #PropertiesSaveContextMenu.Open}">
              <Button.ContextMenu>
                <ContextMenu Name="PropertiesSaveContextMenu" PlacementMode="Bottom">
                  <MenuItem
                    Command="{Binding OnClickPropertiesSaveFile}"
                    Header="To File">
                    <MenuItem.Icon>
                      <Image Source="/Assets/Icons/file-image-16x16.png"/>
                    </MenuItem.Icon>
                  </MenuItem>

                  <MenuItem
                    Command="{Binding OnClickPropertiesSaveClipboard}"
                    Header="To Clipboard">
                    <MenuItem.Icon>
                      <Image Source="/Assets/Icons/clipboard-16x16.png"/>
                    </MenuItem.Icon>
                  </MenuItem>

                </ContextMenu>
              </Button.ContextMenu>
              <StackPanel Orientation="Horizontal">
                <Image Source="/Assets/Icons/save-16x16.png" />
                <TextBlock Text=" ⮟"/>
              </StackPanel>
            </Button>

Problem:

Command="{Binding #PropertiesSaveContextMenu.Open}"

As soon i left click button it crashes. Right click still working and open the context menu. Is there anyway or property that i can set to make left click also open the context menu without the extra code?

Message: Specified method is not supported.

Strack Trace:

   at Avalonia.Controls.ContextMenu.Open()
   at Avalonia.Data.Converters.MethodToCommandConverter.Execute(Object parameter)
   at Avalonia.Controls.Button.OnClick()
   at Avalonia.Controls.Button.OnPointerReleased(PointerReleasedEventArgs e)
   at Avalonia.Input.InputElement.<>c.<.cctor>b__28_9(InputElement x, PointerReleasedEventArgs e)
   at System.Reactive.Subjects.Subject`1.OnNext(T value) in /_/Rx.NET/Source/src/System.Reactive/Subjects/Subject.cs:line 147
   at Avalonia.Interactivity.EventRoute.RaiseEventImpl(RoutedEventArgs e)
   at Avalonia.Interactivity.EventRoute.RaiseEvent(IInteractive source, RoutedEventArgs e)
   at Avalonia.Interactivity.Interactive.RaiseEvent(RoutedEventArgs e)
   at Avalonia.Input.MouseDevice.MouseUp(IMouseDevice device, UInt64 timestamp, IInputRoot root, Point p, PointerPointProperties props, KeyModifiers inputModifiers)
   at Avalonia.Input.MouseDevice.ProcessRawEvent(RawPointerEventArgs e)
   at Avalonia.Input.InputManager.ProcessInput(RawInputEventArgs e)
   at Avalonia.Win32.WindowImpl.AppWndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam)
   at Avalonia.Win32.WindowImpl.WndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam)
   at Avalonia.Win32.Interop.UnmanagedMethods.DispatchMessage(MSG& lpmsg)
   at Avalonia.Win32.Win32Platform.RunLoop(CancellationToken cancellationToken)
   at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken)
   at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args)
   at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime[T](T builder, String[] args, ShutdownMode shutdownMode)
   at UVtools.WPF.Program.Main(String[] args) in D:\Tiago\Dropbox\Programming\C#\UVtools\UVtools.WPF\Program.cs:line 26

[donandren]

item.ContextMenu.Open();// NotSupported
item.ContextMenu.Open(null);//working 

why not ContextMenu.Open() call ContextMenu.Open(null) instead throw NotSupported?

[maxkatz6]

ContextMenu is planned to be reworked with Flyouts -see https://github.com/AvaloniaUI/Avalonia/issues/5172 But not for 0.10 release.