Passing BitmapImage as Tag to DataTemplate - wpf

Question

I'm a bit unexperienced in WPF and trying to get a simple Template in WPF for a button with an Image icon in addition to text to work.
Style code:
<Style x:Key="DatabaseButtonWithImageTag" TargetType="Button" BasedOn="{StaticResource DatabaseButton}">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Image Grid.Column="0" Width="100" Source="{TemplateBinding Tag}" />
<ContentControl Grid.Column="1" Content="{TemplateBinding Content}" />
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
View code:
<Image Source="{StaticResource image_new_patient}"/>
<Button Style="{StaticResource DatabaseButtonWithImageTag}" Tag="{StaticResource image_new_patient}" Width="150" Height="100">
Test!
</Button>
The image outside the button is displayed, so is "Test!", but there is no image inside the button.
What am I doing wrong?

Answer 1

TemplateBinding does not work within a DataTemplate.
You can use this workaroud:
<Window.Resources>
<BitmapImage x:Key="image_new_patient" UriSource="bsp.jpg" />
<local:ImageConverter x:Key="imageConverter" />
<Style x:Key="DatabaseButtonWithImageTag" TargetType="Button">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Image Grid.Column="0" Width="100" Source="{Binding RelativeSource={RelativeSource AncestorType=Button}, Path=Tag}" />
<ContentControl Grid.Column="1" Content="{TemplateBinding Content}" />
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<StackPanel>
<Image Source="{StaticResource image_new_patient}" Width="50"/>
<Button Style="{StaticResource DatabaseButtonWithImageTag}" Tag="{StaticResource image_new_patient}" Width="150" Height="100">
Test!
</Button>
</StackPanel>