Initialize default values for the tool button size

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23128 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/tbargtk.cpp

@@ -258,6 +258,8 @@ void wxToolBar::Init()
     m_bg = (GdkColor *)NULL;
     m_toolbar = (GtkToolbar *)NULL;
     m_blockEvent = FALSE;
+    m_defaultWidth = 32;
+    m_defaultHeight = 32;
 }
 
 wxToolBar::~wxToolBar()