Expander Header Content Stretch

[Kevin Marois]

I've got a listbox with expanders[^] in it. The problem is that expander's header content is not stretched. I've tried all kinds of things, but I can't seem to get it. Here's the XAML

<Expander Padding="{Binding Padding, RelativeSource={RelativeSource TemplatedParent}}"
Margin="{Binding Margin, RelativeSource={RelativeSource TemplatedParent}}"
BorderBrush="{Binding BorderBrush, RelativeSource={RelativeSource TemplatedParent}}"
BorderThickness="{Binding BorderThickness, RelativeSource={RelativeSource TemplatedParent}}"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Auto"
IsExpanded="{Binding IsPaneExpanded, RelativeSource={RelativeSource TemplatedParent}}">

<Expander.Header>

    <Grid>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="\*"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>

        <TextBlock Text="{Binding Header}"
                HorizontalAlignment="Left"
                VerticalAlignment="Center"
                Margin="1"/>

        <Button Grid.Column="1"
                Height="18"
                Width="18"
                Margin="0,1,1,1"/>

    </Grid>

</Expander.Header>

<CONTENT REMOVED FOR BREVITY>

</Expander>

If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.

[Richard Deeming]

Stretching Content in an Expander Header | Josh Smith on WPF[^] The width binding trick won't work, as it will push the button outside of the available space. But the code-behind trick should be OK.

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"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

[Kevin Marois]

That did it. I saw this article already and tried the XAML approach. I should have hep reading. Thanks

If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.