Commented Feature: Expandable Property not expanded by default [20054]

Based on discussion https://wpftoolkit.codeplex.com/discussions/452722, user wants to have an expand property expanded by default.

Maybe having a new ExpandableObjectAttribute which take a true/false parameter would do the job.
Comments: ** Comment from web user: yt2014 **

Is there an example of how to make use of this ExpandableObjectAttribute parameter?

I tried the following:

```
<ExpandableObjectAttribute(True), _
CategoryAttribute("Output (%)"), _
DisplayName("Sensible")>
Public Property TotalSensible As Sensible
Get
Return mySensible
End Get
Set(ByVal value As Sensible)
mySensible = value
End Set
End Property
```
but get a 'Too many arguments to Public Sub New' error.

I must be doing something wrong.

Thanks for any help