When you convert existing asp.net project to 4.5 framework , you will notice that all the UI elements have blue border around them

Making these changes in web.config will solve the problem
<pages enableSessionState=”true” enableViewState=”true” enableViewStateMac=”true” validateRequest=”true” viewStateEncryptionMode=”Always” controlRenderingCompatibilityVersion=”3.5” clientIDMode=”AutoID”></pages>
and
<compilation defaultLanguage=”c#” debug=”true” batch=”false” targetFramework=”4.5” >
