'宣言 Function SetSpanGC( _ ByVal itemBeingDragged As ILayoutItem, _ ByVal spanX As Integer, _ ByVal spanY As Integer, _ ByVal labelSpanX As Integer, _ ByVal labelSpanY As Integer, _ ByVal preferredLabelWidth As Integer, _ ByVal preferredLabelHeight As Integer, _ ByVal preferredCellWidth As Integer, _ ByVal preferredCellHeight As Integer _ ) As Boolean