PDFOffice_Windows_exe/PDF Office/CustomControl/WritableComboBox.xaml

<UserControl
    x:Class="PDF_Office.CustomControl.WritableComboBox"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:PDF_Office.CustomControl"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="24"
    d:DesignWidth="200"
    Loaded="UserControl_Loaded"
    mc:Ignorable="d">
    <Grid>
        <ComboBox
            x:Name="writableComboBox"
            Grid.Column="1"
            MinWidth="58"
            MinHeight="24"
            VerticalContentAlignment="Center"
            SelectedIndex="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:WritableComboBox}, Path=SelectedIndex}"
            SelectionChanged="writableComboBox_SelectionChanged"
            Visibility="Visible">
            <ComboBoxItem x:Name="AllPageItem" Tag="AllPage" Visibility="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:WritableComboBox}, Path=IsAllPageVisible}"/>
            <ComboBoxItem x:Name="OddPageItem" Tag="OddPage"/>
            <ComboBoxItem x:Name="EvenPageItem" IsEnabled="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:WritableComboBox}, Path=EvenPageIsEnabled}" Tag="EvenPage"/>
            <ComboBoxItem x:Name="CustomPageItem" Tag="CustomPage"/>
        </ComboBox>
        <TextBox
            x:Name="writableTextBox"
            Grid.Column="0"
            MinHeight="{Binding ElementName=writableComboBox, Path=MinHeight}"
            BorderBrush="{x:Null}"
            BorderThickness="0"
            Margin="2"
            HorizontalAlignment="Left"
            VerticalContentAlignment="Center"
            Panel.ZIndex="1"
            LostFocus="writableTextBox_LostFocus"
            PreviewKeyDown="writableTextBox_PreviewKeyDown"
            Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:WritableComboBox}, Path=Text}"
            TextChanged="writableTextBox_TextChange"
            Visibility="Hidden" />
    </Grid>
</UserControl>