TODO doc for Gtk namespace.

There are in total 324 xml to document in Gtk. Right now there are 160 xml not documented in any proportion.
The idea is to have a easy way to know what documentation is missing, if you want to help or are helping please take out the xml that you commit
from the missing list. For documentation that take some time to finish (like HTML, TextBuffer, etc) the best is that you but your name and email
next to the file in this list to acknowledge that you are working in it (is recommendable that you suscribe to the mono-docs  mailing list).

Following is the list of undocumented xml:

Accel.xml
AccelGroupActivate.xml
AccelGroupEntry.xml
AccelGroupFindFunc.xml
AccelKey.xml
AccelMapForeach.xml
Accelerator.xml
Arg.xml
Callback.xml
CallbackMarshal.xml
ClipboardClearFunc.xml
ClipboardGetFunc.xml
ClipboardReceivedFunc.xml
ClipboardTestReceivedFunc.xml
ColorSelectionButton.xml
ColorSelectionChangePaletteFunc.xml
ColorSelectionChangePaletteWithScreenFunc.xml
DebugFlag.xml
Decorated.xml
DestroyNotify.xml
ExpanderStyle.xml
Function.xml
Gc.xml
GdkInputFunction.xml
Global.xml
HSV.xml
HTML.xml
HTMLBeginFlags.xml
HTMLClassProperties.xml
HTMLCommandType.xml
HTMLCursorSkipType.xml
HTMLEditorAPI.xml
HTMLEditorEventType.xml
HTMLEmbedded.xml
HTMLEmbeddedClass.xml
HTMLEtchStyle.xml
HTMLFontStyle.xml
HTMLFontStyleShift.xml
HTMLParagraphAligment.xml
HTMLParagraphStyle.xml
HTMLPrintCallback.xml
HTMLSaveReceiverFn.xml
HTMLStream.xml
HTMLStreamCloseFunc.xml
HTMLStreamStatus.xml
HTMLStreamTypesFunc.xml
HTMLStreamWriteFunc.xml
IMContext.xml
IMContextInfo.xml
IMContextSimple.xml
IMMulticontext.xml
IMPreedStyle.xml
IMStatusStyle.xml
ImageAnimationData.xml
ImageIconSetData.xml
ImageImageData.xml
ImagePixbufData.xml
ImagePixmapData.xml
ImageStockData.xml
Init.xml
Input.xml
ItemFactoryCallback.xml
ItemFactoruCallback1.xml
ItemFactoryEntry.xml
Key.xml
KeySnoopFunc.xml
ListStore.xml
Main.xml
MenuDetachFunc.xml
MenuPositionFunc.xml
ModuleDisplayInitFunc.xml
ModuleInitFunc.xml
NotebookTab.xml
Object.xml
Paint.xml
PathPriorityType.xml
PathType.xml
PrintFunc.xml
RBNode.xml
RBNodeColor.xml
RBTree.xml
RBTreeTraverseFunc.xml
RBTreeView.xml
RadioMenuItem.xml
Rc.xml
RcFlags.xml
RcProperty.xml
RcPropertyParser.xml
RcStyle.xml
RcTokenType.xml
ReadyEvent.xml
Requisition.xml
ResponseType.xml
RulerMetric.xml
Scale.xml
Selection.xml
SelectionData.xml
Settings.xml
SettingsPropertyValue.xml
SettingsValue.xml
SignalFunc.xml
StockManager.xml
Submenu.xml
TargetEntry.xml
TargetFlags.xml
TargetList.xml
TargetPair.xml
Text.xml
TextAppearance.xml
TextAttributes.xml
TextBTree.xml
TextCharPredicate.xml
TextChildAnchor.xml
TextCounter.xml
TextDirection.xml
TextIter.xml
TextLineSegment.xml
TextLineSegmentClass.xml
TextLogAttrCache.xml
TextMarkBody.xml
TextPendingScroll.xml
TextSearchFlags.xml
TextSegCheckFunc.xml
TextSegCleanupFunc.xml
TextSegDeleteFunc.xml
TextSegLineChangeFunc.xml
TextSegSplitFunc.xml
TextTagInfo.xml
TextTagTable.xml
TextTagTableForeach.xml
TextToggleBody.xml
TextUtilCharChosenFunc.xml
TextWindow.xml
TextWindowType.xml
ThemeEngine.xml
ThreadNotify.xml
TranslateFunc.xml
TreeCellDataFunc.xml
TreeDataList.xml
TreeDestroyCountFunc.xml
TreeDragDest.xml
TreeDragSource.xml
Treelter.xml
TreelterCompareFunc.xml
TreeModelFlags.xml
TreeModelForeachFunc.xml
TreeModelSort.xml
TreePath.xml
TreeRowReference.xml
TreeSelectionForeachFunc.xml
TreeSelectionFunc.xml
TreeSortable.xml
TreeView.xml
TreeViewColumnDropFunc.xml
TreeViewDropPosition.xml
TreeViewMappingFunc.xml
TreeViewSeachEqualFunc.xml
Visibility.xml
WidgetHelpType.xml
WindowKeysForeachFunc.xml