Populate a Dropdown Based on Selection of Another Dropdown in GXT - java

I have a simple dropdown menu that when an item is selected from another dropdown, it should get populated by a set of values from the database based on the selection value of the second dropdown.
How can I do this in GXT 4?

I've put together an example and posted it to a gist. Would this work for you?
https://gist.github.com/branflake2267/65ea27e16868c546ea7e

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Since the code is too much to share I have uploaded the snapshots of both the pages.
https://www.dropbox.com/s/10qmpxzwm8sik8a/1.PNG?dl=0
Here I am entering the values in estimate by selecting the project
https://www.dropbox.com/s/w8macftnm3rez3a/2.PNG?dl=0
Here I want to get the values just by selecting the project from the drop-down without clicking the Find button
You need to be specific with your question.
If I got you right...
You can use a variable in javasceipt to hold the value that was enterd on the other page you got.
Then while using the dropdown on the other page you can retrieve the values that you store and use a simple ajax request with json data to your servelet.
Check here for examples: http://api.jquery.com/jquery.ajax/

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String[] listbox = request.getParameterValues("ToLB");
Following is my second listbox from which i need to retrieve values,
<select multiple size="8" name="ToLB" style="width:278px;" id="customerListToId"></select>
Solved it by myself.. jQuery worked for the above stated problem..

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Your best starting point is probably this example: (Source code also available on this page, ChoicePage.java is the name)
First of all, you have to use a dynamic model in your ListView that generates the list of items depending on what you had selected in the dropdown boxes.
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