Reuse a set Renderer in Grid column

I have the following problem. I want to store all Renderers set to the Grid columns in a HashMap to be able to reuse them, when the DataContainer changes. Right now, this is impossible, because a once set Renderer can’t be reused because there is no way to remove it from the DataContainer to reset the variable “previouslyAttached” to false again. Are you planning to add something like that or do you have any ideas how to work around this issue?