Lets say I have two containers:

```
<StackPanel>
  <Label>First</Label>
</StackPanel>
<StackPanel>
  <Label>Second</Label>
</StackPanel>

```

And I'm bound to this object:

```
public class Model 
{
  public bool ShowFirst { get; set; }
  public bool ShowSecond { get; set; }
}

```

How would I set the binding to show and hide the respective panels?