I did this as workaround (I have a scope variable model : "=ngModel"):
scope.$watch("model", function(newValue, oldValue) {
if (newValue !== undefined) {
kendoNumericBox.data("kendoNumericTextBox").value(newValue);
scope.model = kendoNumericBox.data("kendoNumericTextBox").value()
}
});
While saying this, there is also an issue if you update ngModel from controller it doesn't reflect in input until you click in it so I also did:
scope.model = kendoNumericBox.data("kendoNumericTextBox").value();
to retrieve value back again so it's validated with kendoNumericTextBox.
where kendoNumericBox is return value of kendoNumericTextBox constructor:
kendoNumericBox = elemenet.kendoNumericTextBox({. . .