Example of a Xamarin.Forms Grid definition

Grid.xaml

<Grid>
    <Grid.ColumnDefinitions>
          <ColumnDefinition Width="1*" />
          <ColumnDefinition Width="2*" />
          <ColumnDefinition Width="Auto" />
          <ColumnDefinition Width="*" />
          <ColumnDefinition Width="300" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
          <RowDefinition Height="1*" />
          <RowDefinition Height="Auto" />
          <RowDefinition Height="25" />
          <RowDefinition Height= "14" />
          <RowDefinition Height="20" />
    </Grid.RowDefinitions>
</Grid>