I am not comletely sure that I understood the problem you report - as far as I understood from your explanations you experience problems with naming dynamically created objects. If so, please, note that this is not directly related to RadSlidingPane or RadControls but to general manner of naming objects.
What I can suggest is that you give some name to the variable which is teh new pane and set the desired string you evaluate from the database as its ID as shown below:
RadSlidingPane myPane =
myPane.Scrolling = SplitterPaneScrolling.None;
In this manner you can reference the pane in the code - behind by using the variable name (myPane) and at the same time it will have the correct ID which you can use to reference the pane on the client.
I hope that my explanation and suggestion are helpul, in case I have misunderstood you, please provide more detailed explanations of teh exact problem and the exact goal you want to achieve.
All the best,
the Telerik team