Hello,

I have a RadSplitContainer docked (fill) in a RadGroupBox and would like the users, at runtime, to be able to increase or decrease the height of that RadGroupBox thus increasing or decreasing the size of the split container.  I want the resizing to be doable by the user dragging the top border up or down.  How can I achieve this?

Thanks for any help.

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 RadGroupBox inside. Please, refer to the attached project. 

I hope this scenario is applicable in your case.

All the best,
Peter
the Telerik team