I populate a WPF tree view using data binding. Tree view items are not expanded by default.
The items in the collection the tree view binds to implement an IsExpanded property. A tree view item binds its IsExpanded property to the IsExpanded property of an item in the collection.
In an attempt to make a certain tree view item visible I try successively to expand its ancestors by setting the IsExpanded property of the items in my data collection to true. However only the first level tree view item gets expanded and the second level tree view items become visible.
I reason this is because the hidden tree view items are not created yet. Hence some items in my collection do not have a corresponding tree view item and setting the IsExpanded property has no effect. (But I may be wrong.)
Example
My tree view displays the file system:
- C:\
- D:\
- E:\
To make the folder D:\Users\Alex\Pictures\ visible I get the items “D:”, “Users”, “Alex” and “Pictures” from my collection and set the IsExpanded property to true. The tree view item representing “D:” gets expanded, but no further expansion happens.
- C:\
- D:\
- Users
- Garbage
- Foo
- E:\
Any advice? Thanks!