MARKUS

<UserControl x:Class="KCOM.Controls.ExtendTextBox"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

             xmlns:local="clr-namespace:KCOM.Controls"

             mc:Ignorable="d" 

             d:DesignHeight="450" d:DesignWidth="800">

    <Grid>

        <Grid.ColumnDefinitions>

            <ColumnDefinition/>

            <ColumnDefinition Width="Auto"/>

        </Grid.ColumnDefinitions>

        <TextBlock x:Name="txtBox" TextWrapping="WrapWithOverflow"/>

        <Button Content="+" Width="15" x:Name="btExtend" Click="Button_Click" Grid.Column="1"/>

    </Grid>

</UserControl>