Hi Darran,
Thanks for using Syncfusion products.
The Docking manager serialization has support only to save and load the state of the Docking manager layout but the element with in the layout will not serialize. If you need, you have to serialize the element separately and de-serialize before the load the docking manager state.
We have created a sample to illustrate serializing the properties of the Child controls using Serializable Interface which you can download under the following link.
In this sample we have used the GridColHelper Serializable wrapper class to get and set the properties of the Element while serializing and de- serializing.
Please let me know if the sample helps.
Regards
Surya Narayana
CS_4ac7c77a.zip