c# - ContentPresenter layout pass -

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i trying profile wpf application (to speed listview displaying complex multi-column datatemplated items). , have problem understand figures in application timeline report:

description says:

here column template (xaml):

<gridviewcolumn header="header">     <gridviewcolumn.celltemplate>         <datatemplate>             <stackpanel>                 <stackpanel orientation="horizontal">

questions:

  • what means "element" type of timeline item? layout pass (as understand it) or else?
  • why sum of children ( 1 child = 0.33 ms) not equal total time (7.82 ms) ?
  • what contentpresenter doing 7.5 ms?


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