Hello Stephane,
Currently, the MaskedTextBox widget will not post the form on ENTER. We will further investigate this limitation and will try to propose an improvement in the next release of Kendo UI. For now you can use the suggested workaround in this demo:
http://trykendoui.telerik.com/@ggkrustev/eyEw
Regards,
Georgi Krustev
Telerik
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