Why doesn't TreeView.ButtonPressEvent get raised for single mouse clicks?

[HubKing]

My goal is to enable selecting multiple rows in a TreeView and right-click to show a context menu, just like WinForm's ListView.

On Windows, the context menu is supposed to show up at the moment when the user releases the mouse button, so I tried to add my event handler to the ButtonReleaseEvent of TreeView. But there was a big problem. It seems that GTK TreeView loses the current selection at the moment when the right mouse button is down, because the single row under the mouse pointer gets selected instead.

So, I thought that I need to handle ButtonPressEvent instead, but it seems that my event handler is called only for double or triple clicks, not for single clicks. Why is this so?

[HubKing]

Found answer. I need to add attribute [GLib.ConnectBefore] to the event handler. This kind of thing needs to be documented.