Question

I have an WPF template but it does not show up when starting the application. No errors in WPF and none anywhere. Just no using of the template. How to figure out what the problem is?

<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="MoveThumb.xaml"/>
    <ResourceDictionary Source="ResizeDecorator.xaml"/>
    <ResourceDictionary Source="RotateDecorator.xaml"/>
</ResourceDictionary.MergedDictionaries>

<!-- ContentControl style to move, resize and rotate items -->
<Style x:Key="DesignerItemStyle" TargetType="ContentControl">
    <Setter Property="MinHeight" Value="50"/>
    <Setter Property="MinWidth" Value="50"/>
    <Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>
    <Setter Property="SnapsToDevicePixels" Value="true"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ContentControl">
                <Grid DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                    <Control Name="RotateDecorator"
                 Template="{StaticResource RotateDecoratorTemplate}"
                 Visibility="Collapsed"/>
                    <s:MoveThumb Template="{StaticResource MoveThumbTemplate}"
                     Cursor="SizeAll"/>
                    <Control x:Name="ResizeDecorator"
                 Template="{StaticResource ResizeDecoratorTemplate}"
                 Visibility="Collapsed"/>
                    <ContentPresenter Content="{TemplateBinding ContentControl.Content}"/>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="Selector.IsSelected" Value="True">
                        <Setter TargetName="ResizeDecorator" Property="Visibility" Value="Visible"/>
                        <Setter TargetName="RotateDecorator" Property="Visibility" Value="Visible"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<!-- RotateDecorator Template -->
<ControlTemplate x:Key="RotateDecoratorTemplate" TargetType="Control">
    <Grid>
        <my:RotateThumb Margin="-18,-18,0,0" VerticalAlignment="Top" HorizontalAlignment="Left"/>
        <my:RotateThumb Margin="0,-18,-18,0" VerticalAlignment="Top" HorizontalAlignment="Right">
            <my:RotateThumb.RenderTransform>
                <RotateTransform Angle="90" />
            </my:RotateThumb.RenderTransform>
        </my:RotateThumb>
        <my:RotateThumb Margin="0,0,-18,-18" VerticalAlignment="Bottom" HorizontalAlignment="Right">
            <my:RotateThumb.RenderTransform>
                <RotateTransform Angle="180" />
            </my:RotateThumb.RenderTransform>
        </my:RotateThumb>
        <my:RotateThumb Margin="-18,0,0,-18" VerticalAlignment="Bottom" HorizontalAlignment="Left">
            <my:RotateThumb.RenderTransform>
                <RotateTransform Angle="270" />
            </my:RotateThumb.RenderTransform>
        </my:RotateThumb>
    </Grid>
</ControlTemplate>

Answer 1

try to REORDER the dictioneries & the template and see if it works,

its all about the ORDER, because the last dictionary always overrides his previous Dictionaries (templates) sometimes even if you don’t target the same UIElement !