WPF Object binding

As I know, binding is a technique applied only for properties of an object. Is there any way for us to bind the whole object?

If you don't figure out the question, let's see the case below:
I want to create a WPF user control exposing a property called InnerCaption (TextBlock variable)

XAML code

<UserControl x:Class="myControl.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid>
<TextBlock Name="_innerCaption" > Hello</TextBlock>
</Grid>
</UserControl>

CS code behind

namespace myControl
{
/// <summary>
/// Interaction logic for UserControl1.xaml
/// </summary>
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}

public TextBlock InnerCaption
{
get { return (TextBlock)this.GetValue(InnerCaptionProperty); }
set { this.SetValue(InnerCaptionProperty, value); }
}
public static readonly DependencyProperty InnerCaptionProperty = DependencyProperty.Register(
"InnerCaption", typeof(TextBlock), typeof(UserControl1),new PropertyMetadata(false));
}
}

I want users to be able to customize the InnerCaption at design time such as: modifying its color, its font style ... But I don't know how. Show me a way pls! :(