#402 – Final Child of DockPanel Fills Remaining Space by Default

By default, the last child in the list of child elements of a DockPanel will automatically grow to fill the available space, regardless of the value of the DockPanel.Dock property.

    <DockPanel>
        <Label Content="1st label (Top)" DockPanel.Dock="Top" Background="Bisque"/>
        <Label Content="2nd (Left)" DockPanel.Dock="Left" Background="BurlyWood"/>
        <Label Content="3rd fills remaining space" DockPanel.Dock="Top" Background="Cornsilk"/>
    </DockPanel>

This happens because the DockPanel has a property called LastChildFill that defaults to true.  If we set it to false, we can then dock the last child element–and it will not fill all of the available space.

    <DockPanel LastChildFill="False">
        <Label Content="1st label (Top)" DockPanel.Dock="Top" Background="Bisque"/>
        <Label Content="2nd (Left)" DockPanel.Dock="Left" Background="BurlyWood"/>
        <Label Content="3rd fills remaining space" DockPanel.Dock="Top" Background="Cornsilk"/>
    </DockPanel>

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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