Change the binding type to the DataObject of the property grid during runtime.

Dear Actipro support, 

I want to change the binding type to the Dataobject durring runtime, 

currently the propertyGrid is working with one type 

<grids:PropertyGrid 
IsSummaryVisible="False"
BorderThickness="0"
IsCategorized ="True"
ArePropertiesAutoExpanded="True"
SortComparer="{x:Null}"
CollectionPropertyDisplayMode="Expandable"
DataContext="{Binding PropertyGridVm}"
DataObject="{Binding PGDataObjectVm}"
IsReadOnly="True"/>

for PGDataObjectVm it is customized type 

class PGDataObjectVm
{

list<string> List1 {get; set;}
string String1{get; set;}
string String2{get; set;}
string String3{get; set;}

}

I want to create another type PGDataObjectVm2

class PGDataObjectVm2
{

string String4{get; set;}
string String5{get; set;}
string String6{get; set;}

}

I want to change the binding between type PGDataObjectVm and PGDataObjectVm2 during runtime, for a diffrent display in the propertyGrid

how can I accomplish that?

Looking forward to your reply.