Windows 8.1 Flyout Placement improvements

I like new Flyout control that has been introduced in Windows 8.1 but I think Placement property should be improved since I cannot show a Flyout at the bottom-left or bottom-right of a button (like logged menu Flyout in Windows).

I think Placement should be splitted in HorizontalPlacement (Left, Center, Right) and VerticalPlacement (Top, Bottom) to have more flexibility.

Source: http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/4140418-windows-8-1-flyout-placement-improvements

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