The experienced behavior is caused by a known bug in the 2012.3.1016 version of the Splitter, connected with the functionality of the VisibleDuringInit
property (refer this PITS
item). The issue has already been resolved and it is functioning properly in our latest Service Pack (2012.3.1205), so my suggestion is to upgrade to it.
For the time being you can use the following workaround:
I hope this information is helpful for you.
the Telerik team
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