How can I remove the border radius from a ToolStrip control?

[EliotVU]

See this screenshot, there appears to be a rounded border radius for the KryptonToolStrip control, one I cannot seem to get rid off, I'm not sure if it's a bug or if I'm missing something:

Also (probably a bug) Changing the border radius (0 or -1) of the Dock tabs does not get rid off it.

[Smurf-IV]

FYI: The tab's "Shape" is controlled by Navigator Tab settings