'Declaration

Public Property BeginBuildingOnFirstClick As Boolean

public bool BeginBuildingOnFirstClick { get; set; }

public: __property bool get_BeginBuildingOnFirstClick();
public: __property void set_BeginBuildingOnFirstClick(
   bool value
);

public:
property bool BeginBuildingOnFirstClick {
   bool get();
   void set(bool value);
}

true - building of new selection will be started if mouse is clicked outside the selection; false - current selection will be deactivated if mouse is clicked outside the selection.