InitialState Element (RDL)
Specifies the initial state of a visibility toggle image.
The InitialState element must contain a Boolean expression. If IntitalState is True, the toggle image is a minus sign (-), for expanded. If InitialState is False, the toggle image is a plus sign (+), for collapsed. The ToggleImage element is used in conjunction with the Visibility element on any report items that can be hidden using the text box that is the parent of the parent ToggleImage element.