«MenuButton» TargetType не соответствует типу элемента «Кнопка»

UserControl имеет кнопку с Style = "{StaticResource MenuIconByttonStyle}", определенную в App.xaml, но использование этого UserControl в окне xaml дает ошибку:

'MenuButton' TargetType does not match type of element 'Button'

Не уверен, на что ссылается MenuButton, так как я нигде не могу найти это определение. Если я использую StaticResource MenuIconButtonStyle2 или FlatToolbarButton, я не получаю эту ошибку.

Почему это может быть?

Приложение.xaml:

<Application.Resources>
    <Style x:Key = "FlatToolbarButton" TargetType = "Button">
        <Setter Property = "Width" Value = "16"/>
        <Setter Property = "Height" Value = "16"/>
        <Setter Property = "BorderThickness" Value = "0"/>
        <Setter Property = "BorderBrush" Value = "{x:Null}"/>
        <Setter Property = "Padding" Value = "0"/>
        <Setter Property = "Margin" Value = "0"/>

    </Style>

    <Style x:Key = "MenuIconButtonStyle" TargetType = "Button" BasedOn = "{StaticResource FlatToolbarButton}" >
            <Setter Property = "Background" Value = "Red"/>
            <Setter Property = "Foreground" Value = "Red"/>
            <Setter Property = "Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Grid Background = "#333333">
                            <Border CornerRadius = "0" BorderThickness = "0" BorderBrush = "#333333">
                                <Image  Source = "{StaticResource MenuIcon}" Stretch = "UniformToFill"/> 
                            </Border>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property = "IsMouseOver" Value = "True">
                    <Setter Property = "Cursor" Value = "Hand"/>
                    <Setter Property = "Template">
                        <Setter.Value>
                            <ControlTemplate>
                                <Grid Background = "Aqua">
                                    <Border CornerRadius = "0" BorderThickness = "1" BorderBrush = "Aqua">
                                        <Image  Source = "{StaticResource MenuIcon}" Stretch = "UniformToFill"/>
                                    </Border>
                                </Grid>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </Style.Triggers>
        </Style>


        <Style x:Key = "MenuIconButtonStyle2" TargetType = "Button" BasedOn = "{StaticResource FlatToolbarButton}" >
            <Setter Property = "Background" Value = "{StaticResource  MenuIconBrush}"/> 
        </Style>

TradeListUC.xaml:

   <Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height = "18"/>
        <RowDefinition Height = "*"/>
    </Grid.RowDefinitions>

    <DockPanel  Grid.Row = "0" Background = "#333333"  >

        <Label x:Name = "TitleLabel" FontSize = "12" Content = "Trade List" Height = "16" Width = "100" 
               VerticalAlignment = "Top" Padding = "4,0,0,0" Foreground = "White"   />
        <StackPanel  DockPanel.Dock = "Right"   HorizontalAlignment = "Right" Orientation = "Horizontal"   >
            <TextBox x:Name = "SymbolEntryTb" Width = "100" Margin = "0,0,1,0"  
                     Background = "#999999" BorderBrush = "#AAAAAA" 
                     HorizontalAlignment = "Right"    Padding = "0,-1,0,0" />
            <Button x:Name = "MenuBtn" Style = "{StaticResource MenuIconButtonStyle}">

            </Button>
        </StackPanel>
    </DockPanel>

MainWindow.xaml:

 <TabItem Header = "Trades">
      <Grid>
         <UC:TradeListUC/>
      </Grid>
 </TabItem>