Removes the split.
Removes all window splits from the current document.
•Default Menu: Window > Remove Split
•All Commands: Window > Split > Remove Split
•Toolbar: None
•Status Bar: None
•Default Shortcut Key: SHIFT+F12
•EEID_DELETE_PANES (4284)
editor.ExecuteCommandByID(4284);
editor.ExecuteCommandByID 4284