Added code to make the Expander control have a disabled look.
Added mouse over and pressed effect to the expander toggle button.
Fixes #1270
Merge pull request #1267 from Tide/ExpanderDisabledFix

Fixes #1266
expander style xaml formatting
use BackgroundToForegroundConverter in expander style
GroupBoxHeaderForeground default to null like expander (can be overwritten)
set version to 0.13.0.0
Update 0.13.0.md
Changed MetroDialogOptions to a DependencyProperty
Removed duplicate DependencyProperty definition.
Merge pull request #1277 from Tide/1270.DialogAccentFix

Fixes #1270
xaml formatting for dialog styles
set mahapps to 0.13.1.0 and resources to 0.2.1.0
0.13.1 release notes
Click on Expander header support
Wording
Now Splitbutton popup closes even when no selection changed event fire (fixes #1295)
Merge pull request #1296 from QuantumDeveloper/Split_DropDownButtons

Now Splitbutton popup closes even when no selection changed event fire (...
Merge pull request #1291 from Dotnetifier/patch-1

Click on Expander header support
Merge pull request #1289 from xxMUROxx/hotfix/Make_MetroDialogOptions_DependencyProperty

Changed MetroDialogOptions to a DependencyProperty