[IMP]:added invisible attr for button it will be useful in treeview
[IMP]:added invisible attr for button it will be useful in treeview
gisce/openobject-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,splbio/openobject-server,gisce/openobject-server,splbio/openobject-server,vnc-biz/openerp-server,ovnicraft/openerp-server,vnc-biz/openerp-server,xrg/openerp-server,ovnicraft/openerp-server,xrg/openerp-server,gisce/openobject-server,MarkusTeufelberger/openobject-server