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User.UITheme does not work

Hi All,

Created the following simple visualforce page, and then a tab based on this page. Enabled lightning experience and then visited the tab (App Launcher -> Other Items -> this tab). The option "Available for Salesforce mobile apps and Lightning Pages" is also enabled.

The output shows Theme3 instead of Theme4d. What am I doing wrong?

<apex:page showHeader="true" >
Best Answer chosen by ssoftware
David HalesDavid Hales
Hi, the below workaround code worked for me to differentiate between Classic & Lightning UI.
<apex:page showHeader="true" sidebar="true">
    <apex:outputPanel rendered="{!$User.UITheme == 'Theme3'}">Currently in Classic UI</apex:outputPanel><br/>
    <apex:outputPanel rendered="{!$User.UITheme != 'Theme3'}">Currently in Lightning Experience UI</apex:outputPanel>

If the above suggestion worked, let us know by marking the answer as "Best Answer" right under the comment which will help the rest of the community should they have a similar issue in the future.

Thanks & Regards 
David Hales(1044)