I need to set font size in GroupHeaderItemStyle. but it does not work when i set value for GroupHeaderItemStyle-Font-Size in MasterTableView or Font-Size in GroupHeaderItemStyle tab. May i know the reason why its not working?
I have tried to replicate the same with 'GroupHeaderItemStyle-Font-Size' and it is working as expected. Also you can achieve the same by overwriting the default css as shown below.