To make both zones - zoneLeft and zoneRight have their bottom points on the same line I could suggest one of the following options:
- Set the height property of the zones to the desired values so that when their content increases scrollbars will appear and the zones will not get resized. You can take a look at the Zone Orientation online example and the corresponding help article for reference.
- Try to calculate the height of the dock zones client-side at the Application load event and at the OnClientDragEnd event and set the proper height to the dock zones. For your convenience I have attached a sample page which gives a general idea how to achieve such a scenario.
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the Telerik team