give the panel 3D grey colour by default: as it's not a native control, we must give it a colour explicitly

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26538 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/panelg.cpp

@@ -121,7 +121,12 @@ bool wxPanel::Create(wxWindow *parent, wxWindowID id,
                      long style,
                      const wxString& name)
 {
-    return wxWindow::Create(parent, id, pos, size, style, name);
+    if ( !wxWindow::Create(parent, id, pos, size, style, name) )
+        return false;
+
+    SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
+
+    return true;
 }
 
 wxPanel::~wxPanel()