This use-case is quite unusual and I trying to fully understand it first. Can you share an example flow of the user's interaction with the Grids? For instance when they click on grid A Edit and save what happens? Then going to Grid B and clicking on Edit what would be the action triggered?
As far as I understand all of the actions are required only the client-side. If the DataSource of the DropDownList in Grid A is local I assume on Edit of the grid the DropDownList data can be stored in an array for instance and later on Edit of Grid B this array can be applied to the DropDownList of Grid B. Here setDataSource method can be useful to set the dataSource of the DropDownList and rebinds it.
Let me know if this helps.
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