Overwrite InfoProperty of generic wcf client

Hi all
following question:
How do I overwrite a property of a instance of a wcf client which is instantiated as follow:

public abstaract class Manager<T> : IDisposable where T : class, ICommunicationObject, new()
{
    protected T wcfClient;
    public ConnectionManager()
    {
            wcfClient = new T();
    }
}

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The reason I'm using the Manager is because I have several services which I use and wanted to centralize dispose and create method...

Now the Manager code is run as user@domain but the wcfClient must authenticate on the server side with otherUser@otherDomain which forces me to do some thing like:

check this: Impersonate a totally different Windows User in a client

Now I wanted to keep the Manager and add something like

Type cType = wcfClient.GetType().getBaseType;

PropertyInfo[] props = cType.GetProperty("ClientCredentials")
							.PropertyType.GetProperty("Windows")
							.PropertyType.GetProperty("ClientCredential")
							.PropertyType.GetProperties();


foreach (PropertyInfo p in props)
{
    if (p.Name.Equals("Domain"))
    {	
	/*
	 * How do I instantiate the the outerprop ?? */
	object outerProp = p.PropertyType.GetConstructor(new Type[] { }).Invoke(new object[] { });
        if (p.CanWrite)
        {
            p.SetValue(outerProp, "otherDomain", null);
        }
    }
	
	if (p.Name.Equals("UserName"))
    {	
	/*
	* How do I instantiate the the outerprop ?? */
	object outerProp = p.PropertyType.GetConstructor(new Type[] { }).Invoke(new object[] { });
        if (p.CanWrite)
        {
            p.SetValue(outerProp, "username", null);
        }
    }
	
	if (p.Name.Equals("Password"))
    {	
	/*
	* How do I instantiate the the outerprop ?? */
	object outerProp = p.PropertyType.GetConstructor(new Type[] { }).Invoke(new object[] { });
        if (p.CanWrite)
        {
            p.SetValue(outerProp, "xxxxxx", null);
        }
    }
}

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to add/overwrite the client credential but got stuck.
How do I instantiate the outerProp to correctly use the SetValue method on the specific InfoProperty of the wcfClient.

Or is there a way to get the wcfClient instance knowing the type?

Any better way to reset/overwrite the wcfClient credential could also be a solution to my problem...

Thanks for your support
th*