Buildable.customTagStart

bool customTagStart(gtk.builder.Builder builder,  gobject.object.ObjectWrap child,  string tagname,  out  glib.types.MarkupParser parser,  out  void *  data)

This is called for each unknown element under <child>.

Parameters

`builder`	a #GtkBuilder used to construct this object
`child`	child object or null for non-child tags
`tagname`	name of tag
`parser`	a #GMarkupParser to fill in
`data`	return location for user data that will be passed in to parser functions

Returns

true if a object has a custom implementation, false

if it doesn't.