odoo/addons/crm/wizard/crm_lead_to_partner_view.xml

<openerp>
      <data>

        <!-- Lead to partner confirmation form -->

          <record id="view_crm_lead2partner_create" model="ir.ui.view">
          <field name="name">crm.lead2partner.view.create</field>
          <field name="model">crm.lead2partner</field>
          <field name="type">form</field>
          <field name="arch" type="xml">
              <form string="Create a Partner?">
                  <label string="Are you sure you want to create a partner based on this lead ?" colspan="4"/>
                <label string="You may have to verify that this partner does not exist already." colspan="4"/>
                <separator string="" colspan="4" />
                  <group col="4" colspan="4">
                      <button special="cancel" string="_Cancel" icon="gtk-cancel"/>
                      <button name="open_create_partner" string="Create _Partner" type="object" icon="gtk-ok"/>
                  </group>
              </form>
          </field>
       </record>

       <!-- Lead to Partner form view -->

       <record id="view_crm_lead2partner" model="ir.ui.view">
          <field name="name">crm.lead2partner.view</field>
          <field name="model">crm.lead2partner</field>
          <field name="type">form</field>
          <field name="arch" type="xml">
              <form string="Create a Partner">
                  <field name="action"/>
                  <group attrs="{'invisible':[('action','!=','exist')]}">
                    <field name="partner_id" attrs="{'required': [('action', '=', 'exist')]}"/>
                </group>
                <separator string="" colspan="4" />
                  <group col="4" colspan="4">
                      <button special="cancel" string="Cancel" icon="gtk-cancel"/>
                      <button name="make_partner" string="Continue" type="object" icon="gtk-ok"/>
                  </group>
              </form>
          </field>
       </record>

       <!-- Lead to Partner wizard -->

       <act_window id="action_crm_lead2partner"
            key2="client_action_multi" name="Create a Partner"
            res_model="crm.lead2partner" src_model="crm.lead"
            view_id="view_crm_lead2partner_create" 
            view_mode="form" target="new" view_type="form" />

     </data>
</openerp>