I'm using tabs in my app. I'm aware of at least one customer-reported exception, that I can't reproduce, in which four document windows were open and the DockSite.TileDocumentsVertically command was issued:
"InvalidOperationException: This operation is invalid since the DockingWindow has not yet been registered with a DockSite."
Relevant stack trace:
Is this a confirmed Actipro bug which has been fixed in a later release? I can't currently upgrade due to project scheduling/risk constraints.