WPF: Can i set the width of an element by percentages?

Question

Say I have 2 buttons in an Element and I want to set the 2 elements to always fill up 1/2 width of its containing element each, can i do that?

UPDATE

why cant i do something like

<StackPanel Orientation="Horizontal" Grid.Row="0">
    <Button Content="Click me" Command="{Binding ClickCommand}" Width="1*" />
    <Button Content="Exit" Command="{Binding CloseCommand}" Width="1*" />
</StackPanel>

why doesnt the 1* work in this context? i get the error

Cannot convert "1*"

Answer 1

You can use a Grid with two columns for this.

<Grid>
  <Grid.ColumnDefinitions>
    <ColumnDefinition Width="1*"/>
    <ColumnDefinition Width="1*"/>
  <Grid.ColumnDefinitions/>

  <Button Grid.Column="0">Button1</Button>
  <Button Grid.Column="1">Button2</Button>
</Grid>

Notice the use of star(*) in the ColumnDefinition.Width property. This means that both columns will take up the same amount of space. So in the example above, each button will each occupy 1/2 of the available space of the containing Grid. So if you make one Width to be equal to "2*", that column will take up twice the amount of space as the other column. Hope this makes sense.