I have up to now been using SfTabControl in a Windows 8 app. To set the font size of the tab header text, I've been using the SfTabControl's ItemTemplate. When I tried this in a Windows 8.1 app (using the Syncfusion 8.1 tab control) , it doesn't seem to be working for me - no text appears in the tab header.
I realise it's difficult to give an answer without seeing an example - I'm thinking of how to put one together. In the meantime I thought I'd just ask if you were aware of any differences between the tab control in the Windows 8 and Windows 8.1version that might be relevant to this? Do you by any chance have an example that demonstrates how to set the font of the tab header text?