Hello Stanislav Dudnyk,
Unfortunately our Report Parameters don't support GUID value types. Our suggestion would be to use a string parameter and with a Convert() function to change the parameter type to uniqueidentifier.
I have attached a sample report that shows how to accomplish your task. To run the sample project you will need the AdventureWorks database that comes with Telerik Reporting installation.
The SqlDataSource2 is using a Select statement as the one shown in the following code snippet:
Select Name From Production.Product WHERE rowguid=(SELECT Convert(uniqueidentifier,@RowGuid))
For more information check out Adding Parameters to Report
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