Update App.xaml.cs

fixed HandyOrg#459

add FlexPanel demo

Merge branch 'master' of https://github.com/HandyOrg/HandyControl

add BlendEffectBox

Update README.md

Update README.md

Merge pull request HandyOrg#122 from HandyOrg/add-ImageBlock

Add image block

add new tabcontrol style and radiobutton style

add brush example and label style