+ /**
+ Adds a stretchable space to the toolbar.
+
+ Any space not taken up by the fixed items (all items except for
+ stretchable spaces) is distributed in equal measure between the
+ stretchable spaces in the toolbar. The most common use for this method
+ is to add a single stretchable space before the items which should be
+ right-aligned in the toolbar, but more exotic possibilities are
+ possible, e.g. a stretchable space may be added in the beginning and
+ the end of the toolbar to centre all toolbar items.
+
+ @see AddTool(), AddSeparator(), InsertStretchableSpace()
+
+ @since 2.9.1
+ */
+ wxToolBarToolBase *AddStretchableSpace();
+