Katie,

To do this with the UltraDockManager, you will need to get a reference to both DockAreaPanes and then re-dock them using the Dock method.  The code, in C# would look something like:

        private void ultraButton1_Click(object sender, EventArgs e)
        {
            DockableControlPane dcp1 = this.ultraDockManager1.PaneFromControl(this.ultraButton1);
            DockAreaPane dap1 = dcp1.DockAreaPane;
            DockableControlPane dcp2 = this.ultraDockManager1.PaneFromControl(this.ultraPanel1);
            DockAreaPane dap2 = dcp2.DockAreaPane;

            if (dap1.DockedLocation == DockedLocation.DockedLeft && dap2.DockedLocation == DockedLocation.DockedRight)
            {
                dap2.Size = dap1.Size;
                dap2.Dock(DockedSide.Left);
                dap1.Dock(DockedSide.Right);
            }
            else
            {
                dap1.Size = dap2.Size;
                dap1.Dock(DockedSide.Left);
                dap2.Dock(DockedSide.Right);
            }

~Kim~
        }