Try this,

Suppose you want to open Sale Order form view from your Object. Do as per following

In your xml file, Make Action as per following

For Example,

    <record model="ir.actions.act_window" id="action_your_action_form_test">
        <field name="name">My Test</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">your.object</field>
        <field name="view_type">form</field>
        <field name="view_id" ref="view_object_form_view"/>
    </record>

and for button ,

<button name="%(your_module.action_your_action_form_test)d" string="Test" type="action" states="draft" />

Hope it work for you.