Combine expander and grid (resizable expander)

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Not sure what you are trying to accomplish but i think conceptually the Grid should be part of the Expander.Content, would this work for you?

<Expander Header="Test" ExpandDirection="Right" HorizontalAlignment="Left" Background="LightBlue">
    <Expander.Content>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="5"/>
            </Grid.ColumnDefinitions>
            <TextBlock Text="Lorem ipsum dolor sit"/>
            <GridSplitter Grid.Column="1" Width="5" ResizeBehavior="PreviousAndCurrent" ResizeDirection="Columns"/>
        </Grid>
    </Expander.Content>
</Expander>

Edit: Removed all the triggering from the first column as it seemed unnecessary.

Also: For this to work vertically the GridSplitter’s HorizontalAlignment must be set to Stretch, otherwise it will have zero width by default (of course everything else that is orientation-specific must be adapted as well but that is straightforward)

HorizontalAlignment is the Microsoft .NET property accessor for what is in reality a dependency property. This particular dependency property quite frequently has its apparent “default” value set differently in subclassed elements, particularly controls. […] For example, the apparent “default” of HorizontalAlignment for a Label control will be Left, even though Label inherits HorizontalAlignment direct from FrameworkElement. This is because that value was reset within the default style of Label, within the style’s control template.

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