Fiko already answered your support ticket on the subject. For convenience I will paste his answer here as well:
"This an expected behavior. When two or more RadWindowManager control are rendered (RadFileExplorer contains a RadWindowManager as well) on the page, then the first one is used by the global methods like radopen
, etc. If you ne the global methods to use a specific RadWindowManager, then I recommend you to override the
method (it is used by the rest of the global methods) to returns the desired manager:
desiredWindowManager = $find(
"<%= RadWindowmanager1.ClientID %>"
Alternatively, you can find the desired windowmanager by using the $find method and call its
method in order to open the desired window.
I hope this helps."
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