\helpref{GetNextChild}{wxtreectrlgetnextchild} should be the same variable (and
that nothing should be done with it by the user code).
-Among other functionalities of the tree control are: item sorting with
+Among other features of the tree control are: item sorting with
\helpref{SortChildren}{wxtreectrlsortchildren} which uses the user-defined comparison
function \helpref{OnCompareItems}{wxtreectrloncompareitems} (by default the
comparison is the alphabetic comparison of tree labels), hit testing
may be used to change the current selection. <HOME> and <END> are used to go to
the first/last sibling of the current item. '+', '-' and '*' expand, collapse
and toggle the current branch. Note, however, that <DEL> and <INS> keys do
-nothing by default, but it is custom to associate them with deleting item from
-a tree and inserting a new one in it.
+nothing by default, but it is usual to associate them with deleting item from
+a tree and inserting a new one into it.
+