[ACCEPTED]-Customizing the toggle state of a toggle button in wpf-togglebutton

The issue here is because you are using 11 Image resources. The Image in your resources is a 10 concrete instance of a control. It can 9 only be in one place at a time. So when 8 you have more than one item in your list...

This 7 should work for you:

<Style x:Key="OnOffToggleImageStyle" TargetType="ToggleButton">
 <Style.Triggers>
   <Trigger Property="IsChecked" Value="True">
     <Setter Property="Content">
       <Setter.Value>
         <Image Source="C:\ON.jpg" />
       </Setter.Value>
     </Setter>
   </Trigger>
   <Trigger Property="IsChecked" Value="False">
     <Setter Property="Content">
       <Setter.Value>
         <Image Source="C:\OFF.jpg" />
       </Setter.Value>
     </Setter>
   </Trigger>
 </Style.Triggers>
</Style>

Note that you can improve 6 the performance of this by using an ImageSource for 5 each image file in your resources, then 4 referencing this in the Image. This effectively 3 means that each image is only loaded once 2 from disk, rather than 2*N times (where 1 N is the number of items in your list.)

This answer will help you. In there I took a ToggleButton 9 and styled it to look as the ToggleButton 8 in a TreeView (the + / - part to expand 7 collapse nodes). You'll just need to change 6 the paths that draw the - and + signs, to 5 show your images instead.

Here goes personalized 4 to you, just put an image called "on.jpg" and 3 another one called "off.jpg" under 2 your C:\ directory, and it should work by 1 just copy/pasting into your window:

    <Window.Resources>
        <SolidColorBrush x:Key="GlyphBrush" Color="#444" />
        <ControlTemplate x:Key="toggleButtonTemplate" TargetType="ToggleButton">
            <Grid
                Width="15"
                Height="13"
                Background="Transparent">
                <Image x:Name="ExpandImage"
                      Source="C:\off.jpg"
                      HorizontalAlignment="Left" 
                      VerticalAlignment="Center" 
                      Margin="1,1,1,1" />                     
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="IsChecked"
                     Value="True">
                    <Setter Property="Source"
                      TargetName="ExpandImage"
                      Value="C:\on.jpg"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
        <Style x:Key="toggleButtonStyle" TargetType="ToggleButton">
            <Setter Property="Template" Value="{StaticResource toggleButtonTemplate}" />
        </Style>
    </Window.Resources>
    <Grid>
        <ToggleButton Style="{StaticResource toggleButtonStyle}" />
    </Grid>

Here is a ToggleButton with 3 images and 8 a popup:

1. An image for when IsChecked = false.
2. An image for when IsChecked = true.
3. An image for when IsMouseOver = true.

The images are stored in resources 7 as BitmapImage in order to avoid changing 6 Visuals on trigers.

The image files have 5 to be added to resources and then, the files 4 added to the "Resoruces" folder in the project 3 have to be marked as BuildAction = Resource.

It also applies an 2 opacity to the Image control when the ToggleButton 1 IsEnabled = false;

Code:

    <ToggleButton
        x:Name="btnToggleImage"
        Margin="5"
        Width="50"            
        Height="50"
        >
        <ToggleButton.Resources>
            <BitmapImage x:Key="imgNormal" UriSource="/YOURPROJECTNAME;component/Resources/YourUncheckedImage.png"/>
            <BitmapImage x:Key="imgHover" UriSource="/YOURPROJECTNAME;component/Resources/YourHoverImage.png"/>
            <BitmapImage x:Key="imgChecked" UriSource="/YOURPROJECTNAME;component/Resources/YourCheckedImage.png"/>
        </ToggleButton.Resources>

        <ToggleButton.Style>
            <Style TargetType="ToggleButton">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="ToggleButton">
                            <Image
                                x:Name="PART_Image"
                                Source="{StaticResource imgNormal}"
                                />
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsChecked" Value="true">
                                    <Setter TargetName="PART_Image" Property="Source" Value="{StaticResource imgChecked}"/>
                                </Trigger>
                                <Trigger Property="IsMouseOver" Value="true">
                                    <Setter TargetName="PART_Image" Property="Source" Value="{StaticResource imgHover}"/>
                                </Trigger>
                                 <Trigger Property="IsEnabled" Value="false">
                                    <Setter TargetName="PART_Image" Property="Opacity" Value="0.6"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate> 
                    </Setter.Value>
                </Setter>
            </Style>
        </ToggleButton.Style>
    </ToggleButton>        

    <Popup
        x:Name="popup1"
        PlacementTarget="{Binding ElementName=btnToggleImage}"
        PopupAnimation="Slide"
        IsOpen="{Binding ElementName=btnToggleImage, Path=IsChecked, Mode=TwoWay}"
        StaysOpen="False"
        MinWidth="{Binding ElementName=btnToggleImage, Path=Width}">
        <Grid Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}">
            <!--<ItemsPresenter/>-->
            <Label Content="Hello Wolrd!"/>
        </Grid>
    </Popup>

Like Drew Noakes said, in my snippte there 6 were only two images. So only two items 5 were working properly. I solved this issue 4 with the following snippet.

<ToggleButton
    Grid.Row="0"  Grid.Column="2"  Grid.RowSpan="2"
    VerticalAlignment="Center" HorizontalAlignment="Center"
    IsChecked="{Binding Status}"
    Width="100" Height="35">
  <ToggleButton.Resources>
    <Image x:Key="OnImage" Source="C:\ON.jpg" />
    <Image x:Key="OffImage" Source="C:\OFF.jpg" />
  </ToggleButton.Resources>
  <ToggleButton.Style>
    <Style TargetType="ToggleButton">
      <Style.Triggers>
        <Trigger Property="IsChecked" Value="True">
          <Setter Property="Content" Value="{StaticResource OnImage}">
          </Setter>
        </Trigger>
        <Trigger Property="IsChecked" Value="False">
          <Setter Property="Content" Value="{StaticResource OffImage}">
          </Setter>
        </Trigger>
      </Style.Triggers>
    </Style>
  </ToggleButton.Style>
</ToggleButton>

Simple, I 3 moved the triggers in to the data template. Dunno 2 whether this is the correct answer thou'. Seems 1 to be working