When I Use FindAllChildren,The Application Block, And endLess Loop

[fjwgrace]

befor I Open one application ,I can use Uiautomation.GetDeskTop().GetAllChildren() to get all children .But When I open one application ,After call Uiautomation.GetDeskTop(),when I call GetAllChildren ,the desktop'sChildren ,the thread blocked,and the method GetAllChildren never return .the application below