Equation Calculator with Graphing

<ResourceDictionary x:Class="CommonUtils.Themes.Generic"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:CommonUtils">

    <Style x:Key="DropDownButtonStyle" TargetType="{x:Type Button}" />
    <Style TargetType="local:TextBoxWithHistory" BasedOn="{StaticResource {x:Type TextBox}}">
        <Style.Setters>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="TextBoxBase">
                        <ControlTemplate.Resources>
                        </ControlTemplate.Resources>
                        <Border 
                                BorderThickness="0.4"
                                Background="{TemplateBinding Background}" 
                                BorderBrush="{TemplateBinding Foreground}" 
                                >
                            <StackPanel>
                                <DockPanel>
                                    <Button Width="20" 
                                        x:Name="PART_DropButton"
                                        DockPanel.Dock="Right"
                                        Margin="3,0,0,0"
                                        Height="{TemplateBinding Height}" 
                                        Style="{DynamicResource DropDownButtonStyle}"
                                        Foreground="{TemplateBinding Foreground}"
                                        Focusable="False"
                                            >
                                        <Path Fill="{TemplateBinding Foreground}" Stroke="{TemplateBinding Foreground}" >
                                            <Path.Data>
                                                <PathGeometry Figures="M0,0L6,0L3,3z" />
                                            </Path.Data>
                                        </Path>
                                    </Button>
                                        <ScrollViewer Name="PART_ContentHost" 
                                        Margin="2"
                                        SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" 
                                        HorizontalContentAlignment="Center" 
                                        VerticalContentAlignment="Center"/>
                                </DockPanel>
                                <local:HistoryListPopup x:Name="PART_Popup"
                                       IsOpen="False" 
                                       StaysOpen="False"
                                       Placement="Bottom" 
                                       AllowsTransparency="True"
                                       Width="{TemplateBinding ActualWidth}"
                                       Height="200"
                                       >
                                    <ListBox ItemsSource="{Binding HistoryList}" 
                                         Background="{TemplateBinding Background}" 
                                         Foreground="{TemplateBinding Foreground}"
                                         SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
                                         x:Name="m_historyListBox"
                                             >
                                        <!--SelectedItem="{TemplateBinding local:HistoryListPopup.SelectedItem, Mode=TwoWay}"-->
                                        <!--MouseDoubleClick="OnMouseDoubleClick"-->
                                    </ListBox>

                                </local:HistoryListPopup>
                            </StackPanel>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style.Setters>
    </Style>


    <Style TargetType="{x:Type local:TestCustomControl}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:TestCustomControl}">
                    <Border Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}">
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>