Hi ViN,
You could change the DockTabPostion by using the SetTabPosition method in the Docking Manager. Please refer this code snippet:
this.dockingManager1.SetTabPosition(this.panel1,this.listBox1.SelectedIndex);
Please refer the sample in the below link which illustrates the above:
http://websamples.syncfusion.com/samples/Tools.Windows/F63786/main.htmThank you for using Syncfusion Products.
Kindly let us know if you need any further assistance.
Best Regards,
Jeba.