Unable to fix the Text Entry widget size

I'm struggling with alignment and size of a Text Entry widget: I simply 
can't reduce to exact size.

What I want:
http://img33.imageshack.us/img33/3597/simplemockup.png

What I get:
http://img684.imageshack.us/img684/1138/simplerw.png

The Glade file for the second image:
<?xml version="1.0" encoding="UTF-8"?>
<interface>
   <requires lib="gtk+" version="2.24"/>
   <!-- interface-naming-policy project-wide -->
   <object class="GtkWindow" id="window1">
     <property name="can_focus">False</property>
     <property name="border_width">5</property>
     <signal name="delete-event" handler="on_window1_delete_event" 
swapped="no"/>
     <child>
       <object class="GtkVBox" id="vbox1">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <child>
           <object class="GtkLabel" id="label1">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="xalign">0</property>
             <property name="yalign">0.46000000834465027</property>
             <property name="label" translatable="yes">Label</property>
           </object>
           <packing>
             <property name="expand">False</property>
             <property name="fill">True</property>
             <property name="position">0</property>
           </packing>
         </child>
         <child>
           <object class="GtkHButtonBox" id="hbuttonbox1">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="layout_style">start</property>
             <child>
               <object class="GtkEntry" id="entry1">
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="invisible_char">●</property>
                 <property name="text" translatable="yes">text</property>
                 <property name="primary_icon_activatable">False</property>
                 <property 
name="secondary_icon_activatable">False</property>
                 <property name="primary_icon_sensitive">True</property>
                 <property name="secondary_icon_sensitive">True</property>
               </object>
               <packing>
                 <property name="expand">False</property>
                 <property name="fill">False</property>
                 <property name="position">0</property>
               </packing>
             </child>
           </object>
           <packing>
             <property name="expand">False</property>
             <property name="fill">False</property>
             <property name="position">1</property>
           </packing>
         </child>
         <child>
           <object class="GtkHButtonBox" id="hbuttonbox2">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="spacing">5</property>
             <property name="layout_style">center</property>
             <child>
               <object class="GtkButton" id="button1">
                 <property name="label" translatable="yes">button</property>
                 <property name="use_action_appearance">False</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
               </object>
               <packing>
                 <property name="expand">False</property>
                 <property name="fill">False</property>
                 <property name="position">0</property>
               </packing>
             </child>
             <child>
               <object class="GtkButton" id="button2">
                 <property name="label" translatable="yes">button</property>
                 <property name="use_action_appearance">False</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
               </object>
               <packing>
                 <property name="expand">False</property>
                 <property name="fill">False</property>
                 <property name="position">1</property>
               </packing>
             </child>
           </object>
           <packing>
             <property name="expand">False</property>
             <property name="fill">True</property>
             <property name="position">2</property>
           </packing>
         </child>
       </object>
     </child>
   </object>
</interface>

How can I reduce the size of the Text Entry and fix it to the size of 
the button?

TIA
-- 
Regards,
Manuel Ferrero
R&D department

Reer SpA	
Tel.  +39 011 2482215
Fax. +39 011 859867

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