Defining the Default Content Property
The Content property is the default property of the ContentControl. The ContentPropertyAttribute specifies which property of a class can be interpreted as the main content property when the class is parsed by a XAML processor. This means that when, for example, a TextBlock is placed as a nested element of a Button, the TextBlock is rendered within the button itself:
<Button> <TextBlock Text="Press me!" Foreground="Orange" /></Button>
To further illustrate, the built-in control template for the Button control includes a Border that contains a TemplateBinding to the Content property of the Button, as shown in the following excerpt:
<Border> ...
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