+\func{wxSizerItem*}{Add}{\param{wxWindow* }{window}, \param{const wxSizerFlags\& }{flags}}
+
+\func{wxSizerItem*}{Add}{\param{wxWindow* }{window}, \param{int }{proportion = 0},\param{int }{flag = 0}, \param{int }{border = 0}, \param{wxObject* }{userData = NULL}}
+
+\func{wxSizerItem*}{Add}{\param{wxSizer* }{sizer}, \param{const wxSizerFlags\& }{flags}}
+
+\func{wxSizerItem*}{Add}{\param{wxSizer* }{sizer}, \param{int }{proportion = 0}, \param{int }{flag = 0}, \param{int }{border = 0}, \param{wxObject* }{userData = NULL}}
+
+\func{wxSizerItem*}{Add}{\param{int }{width}, \param{int }{height}, \param{int }{proportion = 0}, \param{int }{flag = 0}, \param{int }{border = 0}, \param{wxObject* }{userData = NULL}}
+
+Appends a child to the sizer. wxSizer itself is an abstract class, but the parameters are
+equivalent in the derived classes that you will instantiate to use it so they are described
+here:
+
+\docparam{window}{The window to be added to the sizer. Its initial size (either set explicitly by the
+user or calculated internally when using wxDefaultSize) is interpreted as the minimal and in many
+cases also the initial size. This is particularly useful in connection with \helpref{SetSizeHints}{wxsizersetsizehints}.}
+
+\docparam{sizer}{The (child-)sizer to be added to the sizer. This allows placing a child sizer in a
+sizer and thus to create hierarchies of sizers (typically a vertical box as the top sizer and several
+horizontal boxes on the level beneath).}
+
+\docparam{width and height}{The dimension of a spacer to be added to the sizer. Adding spacers to sizers
+gives more flexibility in the design of dialogs; imagine for example a horizontal box with two buttons at the
+bottom of a dialog: you might want to insert a space between the two buttons and make that space stretchable
+using the \arg{proportion} flag and the result will be that the left button will be aligned with the left
+side of the dialog and the right button with the right side - the space in between will shrink and grow with
+the dialog.}
+
+\docparam{proportion}{Although the meaning of this parameter is undefined in wxSizer, it is used in wxBoxSizer
+to indicate if a child of a sizer can change its size in the main orientation of the wxBoxSizer - where
+0 stands for not changeable and a value of more than zero is interpreted relative to the value of other
+children of the same wxBoxSizer. For example, you might have a horizontal wxBoxSizer with three children, two
+of which are supposed to change their size with the sizer. Then the two stretchable windows would get a
+value of 1 each to make them grow and shrink equally with the sizer's horizontal dimension.}
+
+\docparam{flag}{This parameter can be used to set a number of flags
+which can be combined using the binary OR operator |. Two main
+behaviours are defined using these flags. One is the border around a
+window: the \arg{border} parameter determines the border width whereas
+the flags given here determine which side(s) of the item that the
+border will be added. The other flags determine how the sizer item
+behaves when the space allotted to the sizer changes, and is somewhat
+dependent on the specific kind of sizer used.
+
+\twocolwidtha{5cm}%
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\windowstyle{wxTOP}\\
+\windowstyle{wxBOTTOM}\\
+\windowstyle{wxLEFT}\\
+\windowstyle{wxRIGHT}\\
+\windowstyle{wxALL}}{These flags are used to specify which side(s) of
+ the sizer item the \arg{border} width will apply to. }
+
+\twocolitem{\windowstyle{wxEXPAND}}{The item will be expanded to fill
+the space assigned to the item.}
+\twocolitem{\windowstyle{wxSHAPED}}{The item will be expanded as much
+as possible while also maintaining its aspect ratio}
+\twocolitem{\windowstyle{wxFIXED\_MINSIZE}}{Normally wxSizers will use
+\helpref{GetAdjustedBestSize}{wxwindowgetadjustedbestsize} to
+determine what the minimal size of window items should be, and will
+use that size to calculate the layout. This allows layouts to
+adjust when an item changes and its \arg{best size} becomes
+different. If you would rather have a window item stay the size it
+started with then use wxFIXED\_MINSIZE.}
+\twocolitem{\windowstyle{wxALIGN\_CENTER wxALIGN\_CENTRE}\\
+\windowstyle{wxALIGN\_LEFT}\\
+\windowstyle{wxALIGN\_RIGHT}\\
+\windowstyle{wxALIGN\_TOP}\\
+\windowstyle{wxALIGN\_BOTTOM}\\
+\windowstyle{wxALIGN\_CENTER\_VERTICAL wxALIGN\_CENTRE\_VERTICAL}\\
+\windowstyle{wxALIGN\_CENTER\_HORIZONTAL wxALIGN\_CENTRE\_HORIZONTAL}}{The wxALIGN flags allow you to
+specify the alignment of the item within the space allotted to it by
+the sizer, adjusted for the border if any.}
+\end{twocollist}
+}
+
+\docparam{border}{Determines the border width, if the \arg{flag}
+ parameter is set to include any border flag.}
+
+\docparam{userData}{Allows an extra object to be attached to the sizer
+item, for use in derived classes when sizing information is more
+complex than the \arg{proportion} and \arg{flag} will allow for.}
+
+\docparam{flags}{A \helpref{wxSizerFlags}{wxsizerflags} object that
+enables you to specify most of the above parameters more conveniently.}
+
+\membersection{wxSizer::AddSpacer}\label{wxsizeraddspacer}
+
+\func{wxSizerItem*}{AddSpacer}{\param{int }{size}}
+
+Adds non-stretchable space to the sizer. More readable way of calling
+\helpref{Add}{wxsizeradd}(size, size, 0).
+
+
+\membersection{wxSizer::AddStretchSpacer}\label{wxsizeraddstretchspacer}
+
+\func{wxSizerItem*}{AddStretchSpacer}{\param{int }{prop = 1}}
+
+Adds stretchable space to the sizer. More readable way of calling
+\helpref{Add}{wxsizeradd}(0, 0, prop).