Based on codeplex discussion https://wpftoolkit.codeplex.com/discussions/642374
Comments: ** Comment from web user: BoucherS **
Comments: ** Comment from web user: BoucherS **
You have to make sure that in the style for LayoutAnchorableFloatingWindowControl, the WindowChrome will have its ShowSystemMenu property set to False.
This will be fixed in v2.9.