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Property-element syntax allows you to assign complex objects to a property. Here is an XAML description for a Button that makes use of a LinearGradientBrush to set its Background property: <Button Height="50" Width="100" Content="OK!" FontSize="20" Foreground="Yellow"> <Button.Background> <LinearGradientBrush> <GradientStop Color="DarkGreen" Offset="0"/> <GradientStop Color="LightGreen" Offset="1"/> </LinearGradientBrush> </Button.Background> </Button> Notice that within the scope of the <Button> and </Button> tags, you have defined a sub-scope named <Button.Background>. Within this scope, you have defined a custom <LinearGradientBrush>. (Don't worry about the exact code for the brush; you'll learn about WPF graphics in 30.) Generally speaking, any property can be set using property-element syntax, that always breaks down to the following pattern: <DefiningClass> <DefiningClass.PropertyOnDefiningClass> <!-- Value for Property here! --> </DefiningClass.PropertyOnDefiningClass> </DefiningClass> While any property could be set using this syntax, if you can capture a value as a simple string, you will save yourself typing time. For example, here would be a much more verbose way to set the Width of your Button: <Button Height="50" Content="OK!" FontSize="20" Foreground="Yellow"> ... <Button.Width> 100 </Button.Width> </Button>

If validation passes, it s time to pass the form and its values to a function that will finally do something as a result of the form s submission. Actually, more than one function could process the form, since the #submit property can contain an array of function names. Each function is called and passed $form and $form_state.

In addition to property-element syntax, XAML defines a special syntax used to set a value to an attached property. Essentially, an attached property allows a child element to set the value for a property that is actually defined in a parent element. The general template to follow looks like this: <ParentElement> <ChildElement ParentElement.PropertyOnParent = "Value"> </ParentElement> The most common use of attached property syntax is to position UI elements within one of the WPF layout managers classes (Grid, DockPanel, etc.). The next chapter dives into these panels in some detail; for now, enter the following in kaxaml: <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Canvas Height="200" Width="200" Background="LightBlue"> <Ellipse Canvas.Top="40" Canvas.Left="40" Height="20" Width="20" Fill="DarkBlue"/> </Canvas> </Page> Here, you have defined a Canvas layout manager that contains an Ellipse. Notice that the Ellipse is able to inform its parent (the Canvas) where to position its top/left position using attached property syntax. There are a few items to be aware of regarding attached properties. First and foremost, this is not an all-purpose syntax that can be applied to any property of any parent. For example, the following XAML cannot be parsed without error: <!-- Error! Set Background property on Canvas via attached property --> <Canvas Height="200" Width="200"> <Ellipse Canvas.Background="LightBlue" Canvas.Top="40" Canvas.Left="90" Height="20" Width="20" Fill="DarkBlue"/> </Canvas> In reality, attached properties are a specialized form of a WPF-specific concept termed a dependency property. Unless a property was implemented in a very specific manner, you cannot set its value using attached property syntax. You will explore dependency properties in a detail in 31.

Note Kaxaml, Visual Studio 2010, and Expression Blend all have IntelliSense, which will show you valid attached properties that can be set by a given element.

As explained, property values are most often represented using a simple string or via property-element syntax. There is, however, another way to specify the value of a XAML attribute, using markup extensions. Markup extensions allow a XAML parser to obtain the value for a property from a dedicated, external class. This can be very beneficial, given that some property values require a number of code statements to execute to figure out the value. Markup extensions provide a way to cleanly extend the grammar of XAML with new functionality. A markup extension is represented internally as a class that derives from MarkupExtension. Note that the chances of your ever needing to build a custom markup extension will be slim to none. However, a subset of XAML keywords (such as x:Array, x:Null, x:Static, and x:Type) are markup extensions in disguise! A markup extension is sandwiched between curly brackets, like so: <Element PropertyToSet = "{MarkUpExtension}"/> To see a markup extensions in action, author the following into kaxaml: <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:CorLib="clr-namespace:System;assembly=mscorlib"> <StackPanel> <!-- The Static markup extension lets us obtain a value from a static member of a class --> <Label Content ="{x:Static CorLib:Environment.OSVersion}"/> <Label Content ="{x:Static CorLib:Environment.ProcessorCount}"/> <!-- The Type markup extension is a XAML verion of the C# typeof operator --> <Label Content ="{x:Type Button}" /> <Label Content ="{x:Type CorLib:Boolean}" /> <!-- Fill a ListBox with an array of strings! --> <ListBox Width="200" Height="50"> <ListBox.ItemsSource> <x:Array Type="CorLib:String"> <CorLib:String>Sun Kil Moon</CorLib:String> <CorLib:String>Red House Painters</CorLib:String> <CorLib:String>Besnard Lakes</CorLib:String> </x:Array> </ListBox.ItemsSource> </ListBox> </StackPanel> </Page> First of all, notice that the <Page> definition has a new XML namespace declaration, which allows you to gain access to the System namespace of mscorlib.dll. With this XML namespace established, you first make use of the x:Static markup extension and grab values from OSVersion and ProcessorCount of the System.Environment class.