Changing Button image when IsEnabled - wpf

Question

I want to change button image when button IsEnabled == False.
Below is my example, bindings are fine, when I change them for False/True it is still not working.
<Button x:Name="btnBackward" Grid.Column="0" Grid.Row="2" Command="{Binding UserWorkflowManager.NavigateBackward}" IsEnabled="{Binding UserWorkflowManager.NavigateBackwardEnable}" Grid.RowSpan="2">
<Button.Template>
<ControlTemplate>
<Image Name="_image" HorizontalAlignment="Center" VerticalAlignment="Center" Stretch="Uniform">
<Image.Style>
<Style TargetType="Image">
<Setter Property="Source" Value="/UserWorkflow.View;component/Images/LDC500_butX_PreviousPane_norm.bmp" />
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=btnBackward, Path=IsEnabled}" Value="False">
<Setter Property="Source" Value="/UserWorkflow.View;component/Images/LDC500_butX_PreviousPane_dis.bmp"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
</ControlTemplate>
</Button.Template>
</Button>

Answer 1

Try the following
<Style.Triggers>
<DataTrigger Binding="{Binding IsEnabled,RelativeSource={RelativeSource AncestorType=Button}}" Value="False">
<Setter Property="Source" Value="/UserWorkflow.View;component/Images/LDC500_butX_PreviousPane_dis.bmp"/>
</DataTrigger>
</Style.Triggers>
Or add the trigger directly in the control template like so
<ControlTemplate>
<Image Name="_image" HorizontalAlignment="Center">
..........
</Image>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter TargetName="_image" Property="Source" Value="/UserWorkflow.View;component/Images/LDC500_butX_PreviousPane_dis.bmp" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>

Answer 2

Try this:
<Button x:Name="btnBackward" Grid.Column="0" Click="btnBackward_Click">
<Button.Template>
<ControlTemplate>
<Image Name="_image" HorizontalAlignment="Center" VerticalAlignment="Center" Stretch="Uniform">
<Image.Style>
<Style TargetType="Image">
<Setter Property="Source" Value="/Images/0.png" />
</Style>
</Image.Style>
</Image>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Source" Value="/Images/1.png" TargetName="_image"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>
</Button>
You should specify "TargetName" property for a setter within "ControlTemplate.Triggers"

Answer 3

The soution is is to use RelativeSource={RelativeSource Self}} in your DataTrigger.
<DataTrigger
Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}}"
Value="False">
Example
Add this style:
<Style x:Key="MainButtonStyle" TargetType="Button" BasedOn="{StaticResource ChromelessButtonStyle}">
<Setter Property="Foreground" Value="Black" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}}" Value="True">
<Setter Property="Background" Value="Green" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}}" Value="False">
<Setter Property="Background" Value="Blue" />
</DataTrigger>
</Style.Triggers>
</Style>
Then apply this style to the button:
<Button x:Name="ActionButton" Style="{StaticResource MainButtonStyle}" Command="{Binding MyCmd}" IsEnabled="{Binding ActionButtonEnabled}"/>