Nie łapie bindingu od commanda

Hej, mam problem z commandem od buttona.
Kod:

Viewer:

<TextBox Name="ValueEditor"
                         Grid.Column="0"
                         Text="{Binding Path=Value, UpdateSourceTrigger=PropertyChanged}"
                         Background="{Binding Path=ValidationColor}"
                         Style="{StaticResource FieldTextBoxStyle}"
                         ToolTip="{Binding Path=FieldValueText}"/>

                <StackPanel HorizontalAlignment="Left" 
                            Width="100" Margin="0 20 0 0" 
                            Visibility="{Binding ElementName=ValueEditor,Path=IsKeyboardFocusWithin,
                    Converter={StaticResource boolToVis}}">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <ItemsControl ItemsSource="{Binding IntelliHintVM.Hints}">
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <Button Content="{Binding Content}" Command="{Binding HintCommand}" FontSize="11"/>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                        </Grid>
                        </StackPanel>

ViewModel:

        private Color _background;
        private string _textAboutTest;
        private ObservableCollection<ButtonIntelliHint> _hints;

        public Color Background
        {
            get { return _background; }
            set
            {
                _background = value;
                RaisePropertyChanged(() => Background);
            }
        }

        public ObservableCollection<ButtonIntelliHint> Hints
        {
            get { return _hints; }
            set { _hints = value; RaisePropertyChanged(() => Hints); }
        }

        public string TextAboutTest
        {
            get { return _textAboutTest; }
            set { _textAboutTest = value; RaisePropertyChanged(() => TextAboutTest); }
        }
        public IntelliHintViewModel(List<string> hints)
        {
            CreateButtons(hints);
        }
        private void CreateButtons(List<string> hints)
        {
            if (Hints is null)
                Hints = new ObservableCollection<ButtonIntelliHint>();
            foreach (string val in hints)
                Hints.Add(new ButtonIntelliHint(this, val));
        }
        public void ApplyHint(string textBoxValue)
        {

        }

oraz viewmodel od ButtonIntelliHint

        IntelliHint.IntelliHintViewModel ViewModel { get; set; }
        public string Content { get; set; }
        public ICommand HintCommand { get; private set; }

        public ButtonIntelliHint(IntelliHint.IntelliHintViewModel vm, string value)
        {
            ViewModel = vm;
            Content = value;
            HintCommand = new RelayCommand(ExecuteHint);
        }

        private void ExecuteHint()
        {
            ViewModel.ApplyHint(this.Content);
        }

Nie wiem dlaczego nie chce mi wejść w ogóle w tego commanda. Content jest pobierany normalnie i wyświetla się wszystko jak powinno. Jakieś pomysły?

Rozwiązane. StackPanel robił się collapsed przez convertera i przez to command nie działał.