property Expression.SplitPaneHeight as Long
Specifies a value that indicates the height in pixels of the top pane(s) when splitting.

TypeDescription
Long A long expression that indicates the width of the left pane(s) when splitting.
By default, the SplitPaneHeight property is 0. Use the SplitPaneHeight property to split vertically the expression control. Use the SplitPaneWidth property to split horizontally the expression control. Use the AllowSplitter property to show or hide certain splitters. Use the FocusPane property to specify the index of the pane that has the focus.