app/helpers/application_helper/toolbar/x_vm_vmtree_center.rb
class ApplicationHelper::Toolbar::XVmVmtreeCenter < ApplicationHelper::Toolbar::Basic
button_group('vmtree_tasks', [
button(
:vm_compare,
'ff ff-compare-same fa-lg',
N_('Compare selected VMs'),
nil,
:url_parms => "main_div",
:send_checked => true,
:enabled => false,
:onwhen => "2+"),
])
end