nested grid with checkbox -- it is urgent -- pls help me

[yogarajan]

Hi all,
I need to display two sets of records.
The second one should come under the first set of records and also second one uses the first one's unique id.
for example,
First table values
id Show/hide button checkbox category
1 <Hide button> <checkbox> car (parent)
<checkbox> Maruthi (child)
<checkbox> BMW(child)
<checkbox> HeroHonda(child)
<checkbox> Yamaha(child)

2 <Show button> <checkbox> bike

3 <Hide button> <checkbox> fruits
<checkbox> Apple
<checkbox> Orange
<checkbox>Mango
.
.
.
(etc)


1. if i click show button that time only child grid is show . button caption change to 'hide'
2. if i click hide button that time only child grid is hide. button caption change to 'show'

2. if i select parent checkbox (ie. checked)(ex. parent -> car ) that corresponding child grid (ex. child -> Maruthi, BMW, HeroHonda, Yamaha) also select(ie. checkbox checked)
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So, How to Do it?.