I apologise for not understanding the desired behaviour.
When the Kendo UI Grid goes into edit mode, it brings up an editable window with editors. Each of the built-in editors is bound to the model property, therefore updating any value in the popup, updates the model dynamically.
If the popup form has some custom editors, for example, a DropDownList, then it should be bound to the property - either by setting the name of the respective input or by specifying data-bind="value: PropertyName".
In case this is not the desired behaviour, could you please explain what is with step by step instructions or screenshots.
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