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TreeView inside a XamOutlookBar with missing toggle icon
posted

Hi,

I have a TreeView inside a XamOutlookBar. But, the TreeView's default expand/collapse icon is invisible. The functionality is there, I can click on the blank area of the icon and the list will expand/collapse.

How can I make the expand/collapse icon to be visible?

Refer to the image below, by default, there should be an expand/collapse arrow icon at the left of each group (Group 1, Group 1a, Group 1b).

Attached is my xaml code, the treeview and xamoutlookbar items bind from a datacontext from the viewmodel.

Thanks,

Vincent

MasterView.zip
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