Я успешно использовал этот подход
http://caliburnmicro.codeplex.com/discussions/222892?ProjectName=caliburnmicro
public class FocusBehavior : Behavior<Control>
{
protected override void OnAttached()
{
AssociatedObject.GotFocus += (sender, args) => IsFocused = true;
AssociatedObject.LostFocus += (sender, a) => IsFocused = false;
AssociatedObject.Loaded += (o, a) => { if (HasInitialFocus || IsFocused) AssociatedObject.Focus(); };
base.OnAttached();
}
public static readonly DependencyProperty IsFocusedProperty =
DependencyProperty.Register(
"IsFocused",
typeof(bool),
typeof(FocusBehavior),
new PropertyMetadata(false, (d, e) => { if ((bool)e.NewValue) ((FocusBehavior)d).AssociatedObject.Focus(); }));
public bool IsFocused
{
get { return (bool)GetValue(IsFocusedProperty); }
set { SetValue(IsFocusedProperty, value); }
}
public static readonly DependencyProperty HasInitialFocusProperty =
DependencyProperty.Register(
"HasInitialFocus",
typeof(bool),
typeof(FocusBehavior),
new PropertyMetadata(false, null));
public bool HasInitialFocus
{
get { return (bool)GetValue(HasInitialFocusProperty); }
set { SetValue(HasInitialFocusProperty, value); }
}
}
<TextBox x:Name="UserName" Style="{StaticResource LoginTextBox}">
<i:Interaction.Behaviors>
<localBehaviors:FocusBehavior HasInitialFocus="True"
IsFocused="{Binding UserNameIsFocused, Mode=TwoWay}"/>
</i:Interaction.Behaviors>
</TextBox>