I have similar question to Telerik WebAii Framework - How to change focus to newy opened page/window but I face another problem.
The code opens the first window (e.g. W1) then clicks on a link which opens a new child window - W2. W2 opens new child window W3. After W3 is closed I need to shift focus to W2. How can I do that? I have following error because Telerik doesn't switch to proper window
InError set by the client. Client Error:
System.ArgumentNullException: Value cannot be null.
Parameter name: SetCurrentDocumentMarkup. The document object is null. Unable to get markup. Probably the Html Document was closed prior to executing the action.