Oracle Forms

Hi All,

I have developed New Form,Whic is having 3Blocks,Based On 2Blocks i have created Mater-Detail Relation.In that Front End i have put one Button to call another Block it is also looking like Form.

My Form Flow is like this :
I will open the Form and enter the data and saved the records,if i click the next block Button i'm able to open that also.For that i will enter data and saved.

My Scenario is :
I have a check Box in the 1st block,when form is opned it should be disabled,atfer entering that form data and saved and next goto 3block and data entered should be saved then if i come to main form at that time i have check the box.after enterning all records only my check box should be enabled.

Can any one help me in this,bit urget

Regards
Siva