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How to get the value of instance variable

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Hi,

 

I have  the following window , window1,window2,window3.

 

window2, window3 are  inherited from window1.  Window1 has an instance variable  with value  is_flag = 'First Counter"  which was set in window1. But when I am using that variable is_flag ,  in Window2 and Window3  it is getting as null. The value "First Counter" is not getting from window2 and window3.

 

How I can access  the value  in Windows2, Windows3 ,  from WIndow1.

 

Regards

Pol


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