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+general list:
+- Window.SizeToFit() or WIndow.OptimalSize() (use: `Window.SetOptimalSize())`) for sizing a window to the control's interest
+	- with the current code, will be a bit of a kludge, because preferredSize() assumes it's running on the main thread without locks
+- Control.Show()/Control.Hide()
+- Groupbox
+- character-limited entry fields (not for passwords), numeric entry fields, multiline entry fields
+	- possible rename of LineEdit?
+		- especially for password fields - NewPasswordEntry()?
+- padding and spacing in Stack
+- allow Combobox to have initial settings
+- Combobox and Listbox insertions and deletions should allow bulk (...string/...int)
+- Combobox/Listbox.DeleteAll
+- Combobox/Listbox.Select (with Listbox.Select allowing bulk)
+	- Checkbox.Check or Checkbox.SetChecked
+- Listbox.SelectAll
+- Listbox/Combobox.Index(n)
+	- Index(n) is the name used by reflect.Value; use a different one?
+- figure out where to auto-place windows in Cocoa (also window coordinates are still not flipped properly so (0,0) on screen is the bottom-left)
+	- also provide a method to center windows; Cocoa provides one for us but
+- make Combobox and Listbox satisfy sort.Interface?
+- should a noneditable Combobox be allowed to return to unselected mode by the user?
+- provide a way for MouseEvent/KeyEvent to signal that the keypress caused the Area to gain/lose focus
+	- provide an event for leaving focus so a focus rectangle can be drawn
+
+problem points:
+- because the main event loop is not called if initialization fails, it is presently impossible for MsgBoxError() to work if UI initialization fails; this basically means we cannot allow initializiation to fail on Mac OS X if we want to be able to report UI init failures to the user with one (which would be desirable, maybe (would violate Windows HIG?))
+- make sure GTK+ documentation version point differences (x in 4.3.x) don't matter
+	- I found a GTK+ version number meaning page somewhere; have to find it again (TODO)
+
+twists of fate:
+- listboxes spanning the vertical height of the window don't always align with the bottom border of the edit control attached to the bottom of the window...
+	- this specifically only happens when the window has an odd height; I don't think this can be fixed unless we explicitly ignore the extra pixel everywhere
+- need a way to get ideal size for all controls on Windows, not just push buttons (Microsoft...)
+
+style changes:
+- make specific wording in documentation consistent (make/create, etc.)
+	- document minor details like wha thappens on specific events so that they are guaranteed to work the same on all platforms (are there any left?)
+		- what happens when the user clicks and drags on a listbox
+			- I think this is a platform behavior...
+	- should field descriptions in method comments include the receiver name? (for instance e.Held vs. Held) - see what Go's own documentation does
+- make passing of parameters and type conversions of parameters to uitask on Windows consistent: explicit _WPARAM(xxx)/_LPARAM(xxx)/uintptr(xxx), for example
+	- do this for type signatures in exported functions: (err error) or just error?
+	- do this for the names of GTK+ helper functions (gtkXXX or gXXX)
+	- areaView -> goArea (or change the class name to be like the delegate name?) in area_darwin.go?
+
+far off:
+- localization
+- strip unused constants from the Windows files
+- combine more Windows files; rename some?
+- tab stops
+- rename Stack to Box?
+
+specifics:
+
+WINDOWS
+- DateTime Picker
+- ListView for Tables
+- 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
+	- cannot automatically snap to custom step; need to do it manually
+- 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
+- TODO
+	- commcntl.h has stuff on a font control that isn't documented?
+		- actually not a control, but localization support: http://msdn.microsoft.com/en-us/library/windows/desktop/bb775454%28v=vs.85%29.aspx
+- notes to self:
+	- groupbox is a mode of the BUTTON class (????)
+	- OpenGL: http://msdn.microsoft.com/en-us/library/windows/desktop/dd374379%28v=vs.85%29.aspx
+	- don't use ES_NUMBER for number-only text boxes, as "it is still possible to paste non-digits into the edit control." (though a commenter on MSDN says that's wrong?)
+		- might want to just have spinners and not numeric text boxes???
+
+GTK+
+- GtkCalendar for date selection (TODO doesn't handle times)
+- GtkNotebook for Tabs
+- GtkScale for Sliders
+	- cannot automatically snap to INTEGERS (let alone to custom steps); need to do it manually
+	- natural size is 0x0 for some reason
+- 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
+	- OpenGL is done outside GTK+: https://projects.gnome.org/gtkglext/
+		- only an issue if I want to provide OpenGL by default...
+		- http://stackoverflow.com/questions/3815806/gtk-and-opengl-bindings suggest GtkGLArea is better but that seems to be a Mono thing? also indicates Clutter (with its Cogl) is not an option because it locks you out of using the OpenGL API directly
+			- er no, the Mono thing is just the homepage... but it doesn't say if this targets GTK+ 2 or GTK+ 3, hm. (also it appears to not have been updated since Precise; in Ubuntu it's libgtkgl)
+			- and gtkglext doesn't support GTK+ 3 officially anyway
+			- and cairo doesn't seem to support OpenGL explicitly so it looks like I will need to communicate with glx directly: http://stackoverflow.com/questions/17628241/how-can-i-use-gtk3-and-opengl-together
+				- except replace glx with EGL/GLES2 because of Wayland: http://wayland.freedesktop.org/faq.html#heading_toc_j_0 (assuming EGL/GLES2 can work on X11)
+
+COCOA
+- NSDatePicker for date/time selection
+- NSOutlineView for tree views
+- NSSlider for Sliders
+- NSStatusBar
+- NSStepper for Spinners
+	- TODO does this require me to manually pair it with a single-line text entry field?
+- 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
+	- don't look at NSForm; though it arranges in the ideal form layout, it only allows single-line text entry fields as controls
+- TODO:
+	- what does NSPathControl look like?
+
+# Slider Capabilities
+Capability | Windows | GTK+ | Cocoa
+----- | ----- | ----- | -----
+Data Type | int | float | float
+Can Simulate ints? | yes | TODO | TODO
+Mouse Step Snap | 1, fixed | something; likely 0.1 but not sure | yes (`setAllowsTickMarkValuesOnly:`); caveat: must specify an exact number of ticks (see below)
+Keyboard Step Snap | configurable | configurable | TODO (same as mouse?)
+Current Value Display | tooltip during drag | label, always visible | TODO
+Tooltips? | TODO | TODO | TODO
+Ticks | configurable display, configurable interval | TODO | configurable display; configurable COUNT (not interval!)
+Can Catch Mouse Events to Snap? | I think this is how to do it | TODO | TODO
+Preferred Size | given in UI guidelines | natural: 0x0; minimum: TODO | TODO
+
+# Spinner Capabilities
+Capability | Windows | GTK+ | Cocoa
+----- | ----- | ----- | -----
+Data Type | int | float | flaot
+Can Simulate ints? | yes | yes | TODO
+Mouse Step Snap | 1, fixed | configurable | configurable
+Keyboard Step Snap | 1, fixed | configurable (uses same value as mouse) | TODO (same as mouse?)
+Can Catch Events To Snap? | TODO | no need | TODO
+Preferred Size | TODO | TODO | TODO
+
+
+# Dialog box hijack
+## Open/Save Dialogs
+  | Windows | GTK+ | Cocoa
+----- | ----- | ----- | -----
+Directories | no (separate facility provided by the shell) | open and save | open only
+Network vs. local only (URI vs. filename) | Network button enabled by default; can be switched off (**TODO** how are network filenames returned?) | yes (default local only; if local only, changing to, say, smb://127.0.0.1/ will pop up an error box; if nonlocal allowed, filename can be null) | xxx
+Multiple selection | yes | yes | open only
+Hidden files | user-specified; can be switched on in code (but is a no-op?) | hidden by default; can be switched on in code (but is a no-op?) and also by the user | xxx
+Overwrite confirmation | available; must be explicitly enabled | available; must be explicitly enabled | xxx
+New Folder button | xxx | optional (I think enabled by default? should do it explicitly to be safe, anyway) | optional
+Preview widget | xxx | yes; optional, custom | xxx
+Extra custom widget | xxx | yes; optional | yes; optional
+File filters | Specified by "patterns" (consisting of filename characters and * but not space; I assume the only safe ones are *.ext and *.*); multiple patterns separated by semicolons; can have custom labels | Specified by MIME type (handles subtypes; has wildcards) or pattern ("shell-style glob", so I assume over whole basename) or by custom function; can have multiple of the above; can have custom labels; also has a shortcut to add all gdk-pixbuf-supported formats | Specified by "UTI"s or by individual filename extensions (format not documented but appears to be just the extension without embellishments); cannot have labels; 1:1 filter:extension mapping.
+File filter list format | `"Label\0Filter-list\0Label\0Filter-list\0...Label\0FIlter-list\0\0"`; filter for all files is canonically `"All Files\0*.*\0\0"` in the docs (specifically this due to handling of shortcut links); also provides a way for users to write in their own filters | Add or remove individual GtkFileFIlter objects; can select one specified in the list to show by default; default behavior is all files; if selected one when none has been specified, filter selection disabled; filter for all files specified in docs under gtk_file_filter_new() (except doesn't set a name) | NSArray of filter strings, or nil for All Files. There is no provision to have an "all files" option: you either specify a set of filters or you don't. (See filename extension auto-append below.). All filters are applied at once; there is no way to select. We might need to introduce an accessory panel (extra widget) to fake the filtering rules of other platforms...
+Default file name | settable | settable | settable (as the filename label)
+Initial directory | complex rules that have changed over time; we can pass an absolute filename (the previous filename or a default filename) and have its path used (if we specify just a path it will either be used as the filename or the program will crash); or we can give it a directory; or Windows will remember for us for some time, or... | pass previous filename or URI to show; overrides default file name; intended only for saving files (so I don't know if it's possible to remember current directory for opening??????); effect of passing containing directory undocumented(???? in my tests the given folder itself is selected) | has some rules; there is a way to specify a custom one; seems to have the undocumented effect that it selects the file if a file is named
+Confirmation and cancel buttons | xxx | GTK_STOCK_OPEN, GTK_STOCK_SAVE, GTK_STOCK_SAVE_AS / GTK_STOCK_CANCEL | cancel button predefined; confirmation button can be changed (setPrompt:) but **TODO** the docs imply prompt is actually a global property?
+Returned filename rules | xxxx | memory provided by GTK+ itself (so no need to worry about size limits); can return a single filename or URI or a GSList of filenames or URIs | xxx
+Window title | optional; defaults to either Open or Save As | required(?) | optional for save (defaults to Save); unknown (**TODO**) for Open
+Prompt to create new files | available; must be explicitly enabled; seems to only apply to Open File dialogs (**TODO**) | xxx | xxx
+Adds file to a Recent Documents list | available; must be explicitly disabled | xxx | xxx
+Allows nonexistent files to be created in Open dialogs | yes; can be switched off | xxx | xxx
+"Open as read-only"/"Save as read-only" checkbox | provided; default; can be switched off | xxx | xxx
+Navigating changes the current working directory of the program | yes; can be switched off for Save dialogs only (????) | xxx | xxx
+Link following | For .lnk files, enabled by default iff a filter is specified; the All Files filter above is listed as being necessary to follow links; can be shut off with a flag in all cases | xxx | For Finder aliases, setResolvesAliases:
+Help button | Available; old-style dialog boxes need a parent window (Explorer-style ones don't; they just need a hook function) | xxx | xxx
+Extension auto-appending | Optional; three-character maximum; doesn't seem to be available on a per-filter basis | xxx | **NOT OPTIONAL.** The only way to avoid this is to not specify any filters. You can't even circumvent this with a delegate. If the user specifies another extension, they are asked to choose one if setAllowsOtherFileTypes: is set. (**TODO** could we use nameFieldStringValue to circumvent?)
+Other labels | xxx | xxx | field before filename entry can be changed; also can provide an additional optional message
+Multiple selection allows empty selection | xxx | xxx | xxx
+
+TODO
+* Windows: OFN_NOTESTFILECREATE might be necessary
+* Windows: OFN_NOVALIDATE - see what happens without a hook
+* Windows: OFN_SHAREAWARE - this is a weird one but it's network related
+* Windows: templates seem to be how to provide extra parameters, but their usage isn't documented on the OPENFILENAME struct help page; check the rest of MSDN
+* Mac OS X: turn on both setExtensionHidden: and setCanSelectHiddenExtension: to show the extnesion in the dialog
+* Mac OS X: turn on setTreatsFilePackagesAsDirectories: since file packages (bundles) are an OS X-specific concept