WPF - How to setup the height and width of a control based on the current window size?

I tried to set the width and height of my WPF control based on the current window size using data binding and value converters.

This is how I did that.

<Window x:Class=" Blogsprajeesh.Blogspot.WPFSamples.SetControlSizeView"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:local="clr-namespace:Blogsprajeesh.Blogspot.WPFSamples "

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Name="mainWindow"

    Title="SetControlSizeView" Height="300" Width="575">

    <Window.Resources>

        <local:HeightConverter x:Key="heightConverter" />

    Window.Resources>

    <Grid>

        <Grid.RowDefinitions>

            <RowDefinition Height="*" />

        Grid.RowDefinitions>

        <TextBlock Background="RoyalBlue"

                   Height="{Binding ElementName=mainWindow,

                                Path=ActualHeight,

                                Converter={StaticResource heightConverter},

                                ConverterParameter=3}"

                   Text="Some sample text" Grid.Row="0"

                   VerticalAlignment="Center" />

    Grid>

Window>

IValueConverter implementation

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

{

    double __height;

    double __paramValue;

    if(double.TryParse(value.ToString(), out __height))

    {

        if (double.TryParse(parameter.ToString(), out __paramValue))

            return __height / __paramValue;

        else

            return __height / 2;

    }

    return 25;

}