WPF and control auto size

is it possible that if i put a textbox in border container and will not specify height & width of textbox rather specify height & width for border and textbox will take the size of the border. how could i do this. i tried开发者_如何学运维 to do it in xaml but fail. need answer. thanks

http://msdn.microsoft.com/en-us/library/system.windows.horizontalalignment.stretch.aspx

It's nice and easy:

<Border Width="200" Height="70" BorderBrush="Black" BorderThickness="2">
  <TextBox></TextBox>
</Border>

<Grid>
   <Border Width="100" Height="100">
      <TextBox />
   </Border>
</Grid>

The text box will be of size of the border.