use wxBoxSizer in wxPickerBase instead of doing the layout manually + other picker controls fixes (patch 1513042)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39846 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/fontpicker.cpp

@@ -61,6 +61,7 @@ bool wxFontButton::Create( wxWindow *parent, wxWindowID id,
     if (!gtk_check_version(2,4,0))
     {
         m_needParent = true;
+        m_acceptsFocus = true;
 
         if (!PreCreation( parent, pos, size ) ||
             !wxControl::CreateBase(parent, id, pos, size, style, validator, name))