
As title says, if you have a WindowChromed window which has set one or more WindowChrome.Has<Minimize|Restore|Maximize|Close>Button Properties set to false, if you try to left/right/double click in the area where these hidden buttons would be showing, the normal behaviour for titlebar does not occur (i.e. can't drag move, open context menu, etc).
This is more of a problem when you have a dialog which doesn't open very wide to begin with.