Add data to a grid

Hi friends

I don't know how to explain this problem but i will try to do my best

I have a MDI Parent form and 4 child form, one of child is a display
form(frm_display) with a flex grid in which i display some data

The rest 3 forms are used to take some information for the users and process according and display the data in frm_display

eg

In other 3 forms
frm_display as new frm_display

Do-
Do -
Do -

Frm_display.show

ok now my problem is , i have to add some data to frm_display form which is show already ?

how can i check whether frm_display is displayed ?
and how i can work with the same displayed form?

i can't do frm_display as new frm_display
this will create a new frm_display

how do i get the address for the displayed frm_display

Please help


















:)