Hi Peter Zhao,
You can modify the default ControlTemplate
of the RadTreeViewItem
to implement this scenario. You can find more info on how to edit ControlTemplates in Blend here
. Currently the RadTreeViewItem Template Structure
contains a Grid RootElement,
which represents the layout root for the template.
It defines two rows - in the first one is the ContentPresenter
and in the second one is the ItemsPresenter
for the child items. So if you change the rows to columns, you will be able to get the desired look.
I attached a sample project to get you started.
the Telerik team
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