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c# - How to anchor controls in WPF?

I have a a TreeView that fills the top part of the application, but since the number of items in the TreeView changes, my Apply button changes its position vertically. Is there a way to anchor it to the bottom part of the window, so it's always on the right bottom part of the window, i.e. 10x10 distance from the right bottom edge.

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You can either set the HorizontalAlignment and VerticalAlignment on the TreeView or Button (I cannot tell which control you are trying to anchor), or you could place the control inside a DockPanel.

To space the control away from others use the Margin.

Margin="0 0 10 10"

will give you the margin only on the right and bottom

I hope this makes it a bit clearer:

<Window>   
  <DockPanel VerticalAlignment="Stretch">
    <TreeView DockPanel.Dock="Top" />
    <Button DockPanel.Dock="Bottom" Margin="0 0 10 10" />   
  </DockPanel>
</Window>

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