I'm working with a gxt 2.3 application where we have a tab item usein a grid with a form binded with the grid store binding. In the code on some cases i had to change the value of a field based on an other. (if the checkbox is unchecked it gets disabled and if checked in the field gets populated with default values.) For that mechanism I use the setValue() method of the NumberField but i had to assume that the model itself doesn't gets updated if i simply use the setValue() Can you tell me which is the common way to solve this kind of problems?