Hi ,
Thanks for using Syncfusion Products.
You could set the docking window to bottom of the other window using the following statement:
this.dockingManager1.DockControl(this.panel2,this.panel1,DockingStyle.Bottom,190);
This above statement will dock a panel2 into bottom of the panel1. Please refer the attached sample and let me know if you need further assistance.
Thanks,
Vijay
Test Sample