As workaround please, rename the controls with Find & Replace from VS Editor.
this issue is already in development and we will do our best to address it for the Q2 2015 release.
Please check to ensure that the old name doesn't remain in the designer.cs file as this will lead to corruption and instability in this file. Simply remove all references to the old name.
That workaround does work, but it is a monstrous pain in the behind. Please accelerate a fix on this one.