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Asked: 2026-06-15T05:16:33+00:00

I’m trying to implement state images on my treeview; I’d like to have my

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I’m trying to implement state images on my treeview; I’d like to have my own images on the buttons instead of the default + and -.

I’ve got an image showing, but it doesn’t change when I expand the node – apparently I need to explicitly update the state image when the treeview’s state changes.

Which message do I capture (in the main window procedure) to make this happen? TVM_EXPAND doesn’t seem to work, and various discussions online recommend strange things like hit testing a mouse click or something weird like that.

Alternatively, if there’s a whizbang tutorial or something on this, please post it – I’m working off pure MSDN (ugh) and this for the most part…

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1 Answer

  1. Editorial Team

    Via a WM_NOTIFY message, you’ll get TVN_ITEMEXPANDING when an expand button is clicked and TVN_ITEMEXPANDED when the item actually expands/collapses.

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