Stick to the bottom of a StackPanel

Question

In my window, there is a Grid that takes up 100% of the available vertical space. Inside that Grid is a StackPanel with another StackPanel and a Frame inside. I would like t

Answer 1

Looks more like a use case for DockPanel

<DockPanel>
    <StackPanel>
        <!--//normal content-->
    </StackPanel>
    <Frame DockPanel.Dock="Bottom"/> <!--// should stick to the bottom-->
</DockPanel>

Answer 2

A StackPanel is not the correct Panel to use for your requirements as they do not provide the same layout and resizing capabilities as a Grid. Therefore, simply replace it with a Grid, give the majority of the space to the inner StackPanel and then the Frame will stick to the bottom.

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="Auto" />   
    </Grid.RowDefinitions>
    <StackPanel>
       //normal content
     </StackPanel>
     <Frame Grid.Row="1" />
</Grid>

You can find out more about the different WPF Panels in the Panels Overview page on MSDN.

Answer 3

According to MSDN docs about StackPanel

A StackPanel Arranges child elements into a single line that can be oriented horizontally or vertically.

So in your case, StackPanel is not the right control to use. If you want your control to be fixed at a particular position, you can use DockPanel and place your control inside it.

<DockPanel>
        <Frame DockPanel.Dock="Bottom"/>
</DockPanel>