I have answered your support ticket on the matter and I am pasting my response here for anyone else that may have such an issue:
Our controls are IScriptControls
and thus, they rely on the MS AJAX framework to add a $create()
statement for them (you can see it at the end of the source of a page that works fine), which in turn initializes their client-side objects and functionality.
This requires a postback to happen, i.e., the full webform server lifecycle is needed, not just the HTML of the page in question, so it is not possible to add our controls to a page like this, I am afraid.
What I can suggest is either using partial postbacks in the context of the same page to add controls, like you would any regular ASP controls, or loading the external pages in a popup control like RadWindow so you can collect user input when needed. You can see here
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