The UniformGrid
<Window x:Class="LayoutPanels.TheUniformGrid" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="TheUniformGrid" Height="300" Width="300"> <UniformGrid Rows="2" Columns="2"> <Button>Top Left</Button> <Button>Top Right</Button> <Button>Bottom Left</Button> <Button>Bottom Right</Button> </UniformGrid> </Window>