odoo/addons/crm/wizard/crm_lead_to_opportunity_view.xml

<openerp>
  	<data>

	<wizard
            id="wizard_crm_lead_opportunity_set"
            keyword="client_action_multi"
            model="crm.lead"
            name="crm.lead.opportunity_set"
            multi="True" menu="False"
            string="Convert To Opportunity"/>
            
		<!-- Lead to Opportunity confirmation view -->

        <record model="ir.ui.view" id="lead_to_opportunity_pre_view">
            <field name="name">crm.opportunity2meeting.form</field>
            <field name="model">crm.opportunity2meeting</field>
            <field name="type">form</field>
            <field name="arch" type="xml">
                <form string="Convert To Meeting">
                	<label string="Are you sure to schedule a meeting for this Opportunity?" colspan="4"/>
                	<newline/>
                	<separator colspan="4" string=""/>
                	<button name="action_cancel" string="_Cancel"
                		icon="gtk-cancel" special="cancel" />
                	<button name="action_makeMeeting" type="object"
                		string="_Schedule" icon="gtk-go-forward" />
                </form>
            </field>
        </record>
        
		<!-- 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"/>
		        <field name="partner_id"/>
		        <newline/>
		        <field name="planned_revenue"/>
		        <field name="probability"/>
		        <group col="4" colspan="4">
	      			<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>

 	</data>
</openerp>