Set Margin for Button
<Window x:Class="MySecondWpfApp.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MySecondWpfApp" Height="136" Width="275.2"> <Grid> <Button Margin="43.4,40,44.8000000000001,40" Name="button1" >Click</Button> </Grid> </Window>