<Ui xmlns="http://www.blizzard.com/wow/ui/"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.blizzard.com/wow/ui/
    http://wowprogramming.com/FrameXML/UI.xsd">

  <Button name="ClickCastUnitTemplate" virtual="true" inherits="SecureActionButtonTemplate,SecureHandlerEnterLeaveTemplate">
      <Attributes>
          <Attribute name="_onenter" type="string" value="local snippet = self:GetAttribute('clickcast_onenter'); if snippet then self:Run(snippet) end"/>
          <Attribute name="_onleave" type="string" value="local snippet = self:GetAttribute('clickcast_onleave'); if snippet then self:Run(snippet) end"/>
      </Attributes>
  </Button>
</Ui>