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copied!<p>It is as simple as this:</p> <pre><code><Border x:Name="Border1" ... Visibility="Visible" ... /> ... <Trigger SourceName="ListBox1" Property="ListBox.SelectedIndex" Value="-1"> <Setter TargetName="Border1" Property="UIElement.Visibilty" Value="Hidden" /> </Trigger> </code></pre> <p><strong>Update</strong></p> <p>I see from the new code you posted that you're trying to use a trigger directly on the ListBox. The trigger must be in a ControlTemplate to use SourceName. If your UI is done with "custom controls" (my preference), you will already have a ControlTemplate to put it in. If not, you can easily add one by wrapping your XAML in a generic "ContentControl" (base class, not any subclass) and setting its template, like this:</p> <pre><code><Window ...> ... <ContentControl> <ContentControl.Template> <ControlTemplate TargetType="{x:Type ContentControl}"> <Grid> ... <ListBox x:Name="ListBox1" ... /> ... <Border x:Name="Border1"> ... </Border> </Grid> <ControlTemplate.Triggers> <Trigger SourceName="ListBox1" Property="ListBox.SelectedIndex" Value="-1"> <Setter TargetName="Border1" Property="UIElement.Visibility" Value="Hidden" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </ContentControl.Template> </ContentControl> ... </Window> </code></pre> <p>A better solution would probably be to use custom controls. Using a binding with a converter is possible but not as elegant IMHO.</p>

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