RadWindow's Skin does not override it's Mother Skin (RadWindowManager)

[Majid Darab]

hi my dear telerik team :     
My RadWindowManager And RadWindow Like Below :

<telerik:RadWindowManager ID="RadWindowManager1" runat="server"
    Behavior="Minimize, Close, Pin, Move"
    Behaviors="Minimize, Close, Pin, Move" Skin="Outlook">
    <Windows>
        <telerik:RadWindow ID="SupportWindow" runat="server"
            NavigateUrl="~/ForRadWindows/Support.aspx" style="display:none;"
            Behavior="Close, Pin" Behaviors="Close, Pin" Skin="Forest">
        </telerik:RadWindow>
    </Windows>
</telerik:RadWindowManager>

problems :
#1 : SupportWindow does not override it's mother's skin at all...mean i always have Outlook skin instead Forest.
#2 : SupportWindow does not override it's mother's Behaviours at all...
#3 : why we have duplicate BEHAVIOUR and BEHAVIOURS when add them with RadWindowManager ? what is the difference?

thanks in advance