grid

    <Grid Background="#FFB2A3A3">
        <Grid.RowDefinitions>
            <RowDefinition Height="90*"></RowDefinition>
            <RowDefinition Height="10*"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Button Content="Click me!" Grid.Row="1" Grid.Column="1"></Button>      
   </Grid>