WPF TextBox won’t fill in StackPanel

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I’ve had the same problem with StackPanel, and the behavior is “by design”. StackPanel is meant for “stacking” things even outside the visible region, so it won’t allow you to fill remaining space in the stacking dimension.

You can use a DockPanel with LastChildFill set to true and dock all the non-filling controls to the Left to simulate the effect you want.

<DockPanel Background="Orange" LastChildFill="True">
    <TextBlock Text="a label" Margin="5" 
        DockPanel.Dock="Left" VerticalAlignment="Center"/>
    <TextBox Height="25" Width="Auto"/>
</DockPanel>

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