Thank you for contacting us.
I tried to reproduce the issue with version 5.3 but to no avail. I tried to search for a bug logged but couldn't find such and now I am not sure whether I am missing something in the steps for reproduce. Could you please send me a short video with Jing
that demonstrates how the issue appears.
Please accept my apologies for the caused inconvenience. Once we found how the bug is reproduced we can give you information back whether it should require a serious fix and whether we will be ready for the upcoming major release.
the Telerik team