MahApps/MahApps.Metro — pull request #19 by DeCarabas (2012-02-12 15:57:03+00:00)
Title: Make the tab strip atop the tab control bind tightly to the items, rather than filling the entire top row of the control.

Modifying the control template for the tab control allows clicks on
the empty upper-right corner of the tab-control to be used for
something else, e.g., click-and-drag of metro windows. Without this
change, the tab strip captures all of the clicks, and so no other
control can respond.

(The logic is similar for the other tab strip placements: the
bottom-right when the strip is on the bottom, the bottom-left and
bottom-right when the strip is on the left and right, respectively.)