SetCascadingSelection - Add condition to current selection

The action pops up with a dialog that allows entering an OSI condition for selecting instances in the current collection. When popping up, the multi-line edit field contains the last expression entered or is empty. The condition is added to the current selection by using logical ADD. After the filter has been configured, the list will be refreshed and only instances complying the selection criteria will be shown.

Extending selection conditions only works for simple OSI expressions. Multi-statement OSI functions cannot be extended.

Selections (filter) are set for the regions property handle, i.e. in a tree, all regions referring to the same property handle are reduced to the current selection, i.e. when selecting only female for person's children, children lists for each person show female children, only.

The action is disabled, when no selection is set.