have take a default size. If the constraint is wxAsIs, the dimension will
not be changed.
+\perlnote{In wxPerl the constraints are accessed as
+\begin{verbatim}
+ my( \$constraint ) = Wx::LayoutConstraints->new();
+ \$constraint->centreX->AsIs();
+ \$constraint->centreY->Unconstrained();
+\end{verbatim}
+}
+
\wxheading{Derived from}
\helpref{wxObject}{wxobject}