Available in the 2017 R2 Release.
More information you can find here: http://docs.telerik.com/devtools/wpf/controls/raddocking/features/pane-groups#set-minmaxwidth-and-minmaxheight
I too would find this very useful. Note that it is closely related to this other feedback item:
Any update on this? I'm still encountering cases where this functionality would improve the layout/behaviour of screens...
Look at https://www.telerik.com/account/support-tickets/view-ticket?threadid=1073148, we need this feature!
Thank you for your update Christian. Make sure you use the Like button to cast a vote for this feature, as the more votes it gets the higher it goes in our TODO list.
Thanks for finally implementing this!