Created Unassigned: Content missing when undocking anchorable from document pane [21870]

Hi Guys,

There is a problem since v2.3 where if you dock anchorable in document area and then undock it the content of the anchorable is no longer visible. I tracked it down to the templates for LayoutAnchorableControl in per theme XAMLs. Please find attached patch file that fixes the problem.

Best regards,
Boris