Aligning controls on both left and right side in a stack panel in WPF

Question

I have the following code:

Answer 1

Just do not use a StackPanel, StackPanels stack. They do, for obvious reasons, not allow alignment in the direction in which they stack. Use a Grid, with column definitions like so:

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

Answer 2

Even though this is old, should someone come across this like I did, here's a simple solution.

Make a new grid and inside that grid put two stack panels with different Horizontal Alignment.

<Grid>
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
        <!--Code here-->
    </StackPanel>
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
        <!--Code here-->
    </StackPanel>
</Grid>

The possible issue is that now without extra handling the two could overlap with each other.

Answer 3

User @pasx is right. You should use DockPanel and dock the RadioButton to the left side, and your StackPanel with the label to the right side.

<DockPanel>

    <DockPanel 
        DockPanel.Dock="Top" 
        LastChildFill="False" >

        <RadioButton 
            DockPanel.Dock="Left" 
            Content="_Programs" 
            IsChecked="{Binding Path=ProgramBanksSelected}"
            IsEnabled="{Binding Path=ProgramsEnabled}" 
            Margin="8" />

        <StackPanel
            DockPanel.Dock="Right">

            <Label 
                Content="Master" 
                Height="28" 
                Name="MasterFileStatus" 
                VerticalContentAlignment="Center"/>

        </StackPanel>

    </DockPanel>
    ...

Answer 4

As you have set the StackPanel's orientation to Horizontal, the HorizontalAlignment property won't work on child-elements. You can keep the StackPanel if you need additional controls, though I would recommend switching to a Grid (among other things) to build the layout you want.

Also, the Grid will allow you to control the actual width of each column:

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="50" />
        <ColumnDefinition Width="150" />
    </Grid.ColumnDefinitions>

    <RadioButton
        Grid.Column="0"
        ...
    />

    <Label
        Grid.Column="1"
        ...
    />
</Grid>