We've had a major rewrite of DockableWindow/TabStripPanel in the works for a while but until now haven't been able to devote most of our time to it. Now that SyntaxEditor 2.5 and Wizard 3.0 are out, we'll be able to focus on the new development of the rewrite. The rewrite is based on the WinUICore UI framework that SyntaxEditor and Wizard use and has a ton of improved features and designs. It blows DockableWindow away feature-wise. After it's completed, DockableWindow and TabStripPanel customers will be able to upgrade to it as if it were a new DockableWindow version.