How to set count of displayed events in Dashboard event view / simple XML?

I'm trying to add an event view to a dashboard, but Splunk seems to ignore the options set in the XML:

<event>
      <searchName>Global AAA - Failed: bad password</searchName>
      <title>Mistyped Passwords</title>
      <fields>User,NetworkDeviceName</fields>
      <count>15</count>
      <maxLines>1</maxLines>
    </event>

I have also tried other variations like <option name="count">15</option> and <event count=15>. Every time I still get about 26 entries.