BeWoPlaner/BeWo/View/Controls/MonthPicker.xaml

<UserControl x:Class="BeWo.View.Controls.MonthPicker" 
             xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
      <dxe:ComboBoxEdit x:Name="_MonthPicker" IsManipulationEnabled="False" IsTextEditable="False" HorizontalAlignment="Stretch"/>
    </Grid>
</UserControl>