+ wxGridSizer constructors.
+
+ Usually only the number of columns in the flex grid sizer needs to be
+ specified using @a cols argument. The number of rows will be deduced
+ automatically depending on the number of the elements added to the
+ sizer.
+
+ If a constructor form with @a rows parameter is used (and the value of
+ @a rows argument is not zero, meaning "unspecified") the sizer will
+ check that no more than @c cols*rows elements are added to it, i.e.
+ that no more than the given number of @a rows is used. Adding less than
+ maximally allowed number of items is not an error however.
+
+ Finally, it is also possible to specify the number of rows and use 0
+ for @a cols. In this case, the sizer will use the given fixed number of
+ rows and as many columns as necessary.
+
+ The @a gap (or @a vgap and @a hgap, which correspond to the height and
+ width of the wxSize object) argument defines the size of the padding
+ between the rows (its vertical component, or @a vgap) and columns
+ (its horizontal component, or @a hgap), in pixels.