Hi Sharon Eden,
As far as I understand you would like to change the position of a Splitter. Note that instead of changing its position, you will need to change the size of its surrounding SplitPanels. For more information and sample code please refer to this help article
I hope this is helpful. Let me know if you have further questions.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items