Hidden flyout resize fix.

This fixes an issue where flyouts would get resized while hidden and
then getting partially shown.
Add support for menu's

Make regular menu's work in MahApp's metro
Merge pull request #297 from chandramouleswaran/master

Add support for regular menu's
Merge pull request #295 from lukaspj/master

Hidden flyout resize fix
Fix a Panorama Mouse Event issue
Fixed radiobutton foreground bug
Removed tabstops on the min/max/close buttons in a MetroWindow.
add style for VirtualisedListBox
Merge pull request #304 from punker76/master

add style for virtualised ListBox
Merge pull request #303 from blooksa/tabstops

The min/max/close buttons can be tabbed to...
Merge pull request #302 from blooksa/radiobutton

Fixed radiobutton foreground bug
Merge pull request #301 from alfhenrik/master

Fixes Issue #244
Fixed #294 by reverting 8eda48129a (restored #259) relating to metrowindow
Fixed the issue where the close button foreground color didn't match the textbox/passwordbox foreground.
Correct VS Style Implementation - Add horizontal scrollbar support.
Merge pull request #306 from blooksa/textbox-clearbutton

The clear text button in textboxes doesn't match the textbox foreground
Merge pull request #307 from larrybeall/master

VS Styles do not support horizontal scrollbars.
Added a window for displaying all the icons in the resource assembly.
Fixed the mouseover and -down effects on the cleartext button in the passwordbox.
Update MahApps.Metro/Styles/Controls.ContextMenu.xaml

Fixed menuitem cropped on the right.