Hello Josh,
Thank you for the writing.
RadGroupBox does not support such functionality and I not able to provide a workaround for this.
However, you can try to place the
RadGroupBox in a
RadSplitPanel. In this case you will be able to resize the
RadSplitPanel and the Rad
GroupBox inside. Please, refer to the attached project.
I hope this scenario is applicable in your case.
All the best,
Peter
the Telerik team