This indeed solves the problem of the error.

- For source: DesktopModules/Events/EventDetails.ascx nothing happens, the controls stays in month view, details not shown on new page.

- For source: DesktopModules/Events/EventDetails.ascx Event is shown in list view mode on a new page

Can i make it to show it in details mode?

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If you want to check the themes setup, i have a demo portal on the following link: Link

In the edit module controle you need to put a source page, if use the same as the detail (eventdetails.ascx) nothing happens when clicking the day in the month view, the controls is being rerendered in month view, not showing the eventdetails in a new page as i expected.

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On the link, all the event controls are in the default theme.

Had a look at this link. It's not using the Small Theme, since that isn't mentioned when you look at the source of the page. It looks like no theme is being applied at all, apart from possibly the tooltip styling. Something to do with your page is interupting the theme application.

Roger