How Can I design an DataSource with Array in UltimateGrid

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hi
Now,I need to design a custrom DataSource ,and the only sample I can check is the CUGMem ,i have been read it for many times ,but ,i did not know ,how can i manipulate the data in data source ,e g , Most opertaion looks like only manipulate the node 's pointer and there is nothing done to the Grid We see,So ，If I change the data source like add a row or an col ,deleting an row , will the grid will update itself ,if it is ,how does this happened ,I mean ,all the changes will result in call the CUGDataSoucre::GetCell（） or What ,anybody can tell me ,thank you ,best wishes