/**
@class wxGBPosition
- @wxheader{gbsizer.h}
This class represents the position of an item in a virtual grid of rows and
columns managed by a wxGridBagSizer.
/**
@class wxGridBagSizer
- @wxheader{gbsizer.h}
A wxSizer that can lay out items in a virtual grid like a wxFlexGridSizer
but in this case explicit positioning of the items is allowed using
/**
@class wxGBSizerItem
- @wxheader{gbsizer.h}
The wxGBSizerItem class is used by the wxGridBagSizer for tracking the
items in the sizer. It adds grid position and spanning information to the
/**
@class wxGBSpan
- @wxheader{gbsizer.h}
This class is used to hold the row and column spanning attributes of items
in a wxGridBagSizer.