Problem with ContentTemplate (ToggleButton with Image)

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WPF

Hello,

I've created a Custom Control named "ecDateBox" derived by a TextBox. I want a ToggleButton, that has an Image, to appear inside at the right border of the TextBox. This is the ResourceDictionary:

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

	<local:CalendarConverter x:Key="calendarConverter"/>

	<ControlTemplate x:Key="IconButton" TargetType="{x:Type ToggleButton}">
		<Border>
			<ContentPresenter/>
		</Border>
	</ControlTemplate>

	<Style TargetType="{x:Type local:ecDateBox}">
		<Setter Property="Template">
			<Setter.Value>
				<ControlTemplate TargetType="{x:Type local:ecDateBox}">
					<Grid>
						<Border
							removed="{TemplateBinding Background}"
							BorderThickness="{TemplateBinding BorderThickness}"
							BorderBrush="{TemplateBinding BorderBrush}"
							ClipToBounds="True"
							CornerRadius="5"
							Padding="2">
							<ScrollViewer Margin="0" x:Name="PART_ContentHost" />
						</Border>
						<ToggleButton Template="{StaticResource IconButton}"
							Focusable="False"
							IsChecked="False"
							Margin="-1,0,0,0" 
							MaxHeight="{TemplateBinding Height}" Width="20"
							Name="CalendarPopUpButton">
							<Image Name="CalendarImage"
								HorizontalAlignment="Right"
								Source="Images/Calendar.png"
								Stretch="Uniform"
								Visibility="Visible">
							</Image>
						</ToggleButton>
					</Grid>
				</ControlTemplate>
			</Setter.Value>
		</Setter>
	</Style>
</ResourceDictionary>

In MainWindow.xaml I use the Custom Control with a simple

<ecDateBox/>

The Custom Control ecDateBox will be rendered, but there is no ToggleButton in it.
If I remove

Template="{StaticResource IconButton}"

near the Tag

<ToggleButton...

the ToggleButton appears in the Control, but has no Image.

What's wrong with that code?

Thanks in advance.
Michael