In such scenario, only the radwin_close() function that is rendered last on the page will be executed - as it will override the one rendered previously.
What I would suggest is to give a different name to the JS function depending on (for example) RadWindow's ClientID property.
For example, let's say that the RadWindowManager is called RadWindowManager1.
<%= RadWindowManager1.ClientID %>_close()
and you can set the OnClientClose property from codebehind (in the user control) like this:
RadWindowManager1.OnClientClose = RadWindowManager1.ClientID +
I hope this helps.
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