diff -r 56cd8111b7f7 -r 41300fa6a67c src/tools/uic3/uic.cpp
--- a/src/tools/uic3/uic.cpp	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/tools/uic3/uic.cpp	Tue Feb 02 00:43:10 2010 +0200
@@ -322,6 +322,11 @@
         || customWidgetsInfo()->extends(className, QLatin1String("QDockWidget"));
 }
 
+bool Uic::isCustomWidgetContainer(const QString &className) const
+{
+    return customWidgetsInfo()->isCustomWidgetContainer(className);
+}
+
 bool Uic::isStatusBar(const QString &className) const
 {
     return customWidgetsInfo()->extends(className, QLatin1String("QStatusBar"));