X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d1cc09bb6f0c0a75ab84ec147ba41f84d979766b..fe5d86ed04a964e2bbcddae1be7e496b244981dd:/src/xrc/xh_unkwn.cpp

diff --git a/src/xrc/xh_unkwn.cpp b/src/xrc/xh_unkwn.cpp
index 4ff1733125..cad645b68b 100644
--- a/src/xrc/xh_unkwn.cpp
+++ b/src/xrc/xh_unkwn.cpp
@@ -90,6 +90,9 @@ wxUnknownWidgetXmlHandler::wxUnknownWidgetXmlHandler()
 
 wxObject *wxUnknownWidgetXmlHandler::DoCreateResource()
 {
+    wxASSERT_MSG( m_instance == NULL,
+                  _T("'unknown' controls can't be subclassed, use wxXmlResource::AttachUnknownControl") );
+
     wxPanel *panel =
         new wxUnknownControlContainer(m_parentAsWindow,
                                       GetName(), -1,