[This is preliminary documentation and subject to change.]
The SelectionTree control publishes this event that contains the size for the highlighted item. If it is a parent item, it also contains the number of children selected. The string is one of the SelChildCostPos, SelChildCostNeg, SelParentCostPosPos, SelParentCostPosNeg, SelParentCostNegPos or SelParentCostNegNeg strings from the UIText Table.
None.
None.
None.
A Text control on the same modal dialog as the SelectionTree subscribes to this event to display the size of the highlighted item.