<DatePicker Name="HistoryDateTime" Grid.Column="1" Grid.Row="0" HorizontalAlignment="Center" DisplayDateStart="{Binding Path=StartDate}" DisplayDateEnd="{Binding Path=EndDate}" SelectedDate="{Binding Path=SelectedDate}" >
<Interactivity:Interaction.Triggers>
<Interactivity:EventTrigger EventName="SelectedDateChanged" >
<Helpers:InvokeDelegateCommandAction Command="{Binding DataContext.SaveKategorieCommand, ElementName=LayoutRoot}" CommandParameter="{Binding}"/>
</Interactivity:EventTrigger>
</DatePicker>