Hello bo,
I already answered your support ticket on the same subject. For convenience I pasted my reply below:
This issue is not directly related to the RadWindow control but to the way IE prints IFRAMEs (RadWindow is basically an IFRAME). In IE, you need to use
printDocument.execCommand("Print");
More details on the subject are available in
this KB article.
Best wishes,
Georgi Tunev
the Telerik team
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