odoo/addons/crm/wizard/crm_lead_to_opportunity_view.xml

<openerp>
      <data>

        <!-- Lead to Opportunity view -->

          <record id="view_crm_lead2opportunity_create" model="ir.ui.view">
          <field name="name">crm.lead2opportunity.create</field>
          <field name="model">crm.lead2opportunity</field>
          <field name="type">form</field>
          <field name="arch" type="xml">
              <form string="Convert To Opportunity">
                <field name="name"/>
                <group attrs="{'invisible':[('partner_id','=',False)]}" col="2" colspan="2">
                	<field name="partner_id"/>
                </group>
                <newline/>
                <field name="planned_revenue"/>
                <field name="probability"/>
                <separator colspan="4"/>
                <group col="4" colspan="4">
                    <label string="" colspan="2"/>
                    <button special="cancel" string="Cancel" icon="gtk-cancel"/>
                    <button name="action_apply" string="Create Opportunity" type="object" icon="gtk-ok"/>
                </group>
            </form>
          </field>
       </record>
       
       <!-- Lead to Opportunity action -->
       
       <record id="action_crm_lead2opportunity" model="ir.actions.act_window">
          <field name="name">Create Opportunity</field>
          <field name="type">ir.actions.act_window</field>
          <field name="res_model">crm.lead2opportunity</field>
          <field name="view_type">form</field>
          <field name="view_mode">form</field>
          <field name="target">new</field>
       </record>


        <record id="view_crm_lead2opportunity_partner" model="ir.ui.view">
          <field name="name">crm.lead2opportunity.partner.form</field>
          <field name="model">crm.lead2opportunity.partner</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"/>
                <newline />
                <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 special="cancel" name="action_skip" string="_Skip" type="object" icon="gtk-goto-last"/>
                    <button name="make_partner" string="Continue" type="object" icon="gtk-ok"/>
                </group>
            </form>
          </field>
       </record> 

     </data>
</openerp>