Define rows / columns for Grid
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Fun with Panels!" Height="186" Width="501"> <Grid ShowGridLines ="True" Background ="AliceBlue"> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Label Name="lblInstruction" Grid.Column ="0" Grid.Row ="0" FontSize="15">Enter</Label> <Button Name="btnOK" Height ="30" Grid.Column ="0" Grid.Row ="0" >OK</Button> <Label Name="lblMake" Grid.Column ="1" Grid.Row ="0">Make</Label> <TextBox Name="txtMake" Grid.Column ="1" Grid.Row ="0" Width="193" Height="25"/> <Label Name="lblColor" Grid.Column ="0" Grid.Row ="1" >Color</Label> <TextBox Name="txtColor" Width="190" Height="25" Grid.Column ="0" Grid.Row ="1" /> <Rectangle Fill ="LightGreen" Grid.Column ="1" Grid.Row ="1" /> <Label Name="lblPetName" Grid.Column ="1" Grid.Row ="1" >Name</Label> <TextBox Name="txtPetName" Grid.Column ="1" Grid.Row ="1" Width="193" Height="25"/> </Grid> </Window>