ViewBox StretchDirection
<Window x:Class="Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="UseViewbox" Height="208" Width="257"> <Grid> <Viewbox Name="Viewbox1" Stretch="Uniform" StretchDirection="Both"> <Button Height="23" Name="Button1" Width="75">Button</Button> </Viewbox> </Grid> </Window>