WINDOWS
- DateTime Picker
- ListView for Tables
- Progress Bar
- either Property Sheets or Tabs for Tabs
- either Rebar or Toolbar for Toolbars
- Status Bar
- Tooltip (should be a property of each control)
- Trackbar for Sliders
- Tree View
- Up-Down Control for Spinners
- maybe:
	- swap ComboBox for ComboBoxEx (probably only if requested enough)
	- IP Address control (iff GTK+ and Cocoa have it; maybe not necessary if we allow arbitrary target addresses?)
	- ListView for its Icon View?
	- something similar to Task Dialog might be useful to have as a convenience template later

GTK+
- GtkNotebook for Tabs
- GtkProgressBar
- GtkScale for Sliders
- GtkSpinButton for Spinners
- GtkStatusBar
- GtkToolbar
- maybe:
	- GtkFontButton would be nice but unless ComboBoxEx provides it Windows doesn't
		- same for GtkColorButton
	- GtkIconView
	- GtkSeparator (I think Windows makes this a mode of Static controls?)
notes to self:
- groupbox is GtkFrame
- GtkTreeView can do tree views and Tables

COCOA
- NSOutlineView for tree views
- NSProgressIndicator for ProgressBar
- NSSlider for Sliders
- NSStatusBar
- NSStepper for Spinners
- NSTabView for Tabs
- NSTableView for Tables
- NSToolbar
- maybe:
	- NSBrowser seems nice...???
	- NSCollectionView for Icon View?
	- NSColorWell is the color button
	- NSOpenGLView for OpenGL; need to see how much OpenGL-specific stuff I need to expose
	- NSRuleEditor/NSPredicateEditor look nice too but
notes to self:
- groupbox is NSBox
- non-editable combobox is NSPopUpButton
- editable combobox is NSCombobox
- don't look at NSForm; though it arranges in the ideal form layout, it only allows single-line text entry fields as controls
- NSSecureTextField does password entries
TODO:
- what does NSPathControl look like?