Added scrollbars to Listbox.

sysdata_windows.go

@@ -68,9 +68,10 @@ var classTypes = [nctypes]*classData{
 	},
 	c_listbox:		&classData{
 		name:			"LISTBOX",
-		style:			0 | controlstyle,
+		// TODO also _WS_HSCROLL?
+		style:			_WS_VSCROLL | controlstyle,
 		xstyle:			0 | controlxstyle,
-		altStyle:			_LBS_EXTENDEDSEL | controlstyle,
+		altStyle:			_LBS_EXTENDEDSEL | _WS_VSCROLL | controlstyle,
 		appendMsg:		_LB_ADDSTRING,
 		insertAfterMsg:		_LB_INSERTSTRING,
 		deleteMsg:		_LB_DELETESTRING,

todo.md

@@ -9,7 +9,6 @@ so I don't forget:
 - password entry fields, character-limited entry fields, numeric entry fields, multiline entry fields
 	- possible rename of LineEdit?
 - more flexible size appropriation: allow a small button to be at the top of everything in the main() example here
-- scrollbars on listboxes (shouldn't they be automatic? or is that just wine being dumb?)
 - [Windows] should ListBox have a border style?
 - padding and spacing in Stack; maybe a setting in Stack which keeps controls at their preferred size?
 - change Stack/Combobox/Listbox constructors so that there's a separate constructor for each variant, rather than passing in parameters?