Gets the index of the first element in the container window.
![](../icons/collapse_all.gif)
![](../icons/collapse_all.gif)
The index of the element, where the first element in the container has an index value of 0 (zero).
If no window has been set (not set when the IContainerSubscriptionParameters was created
or there has been no previous call to SetWindow(Int32, Int32)),
the value will be MinValue.