[V4RB] beginners question store global objectRefs

[peter salomon]

Hi all,

as i come from Lingo i have not well understood how RB handles global 
variables. I know that this one is more a RB question but maybe 
concerning V4rb there might be a common way..

I´ve tested the tutorial file where the databaseobject was created by 
caling "new"
Then it´s stored within a property which is set to public.
ok so far, i can use it within THIS window.

But now i want to implement other functions within another new window, 
e.g. a preferencepanel.

when i try to use the databaseobject from main windows property i get a 
nilobjectexception.
hm - ok, so i made a function in which i transport the objectreference 
to the new window, something like:

prefsWindow.prepare(databaseRef)

method prepare is defined as
prepare(inDB As VDatabase)

// filling properties
mtblA = inDB.table("tblA")
mtblB = inDB.table("tblB")
.
me.show()
.
end

 i have created again some properties for this window with my tableRef 
names:

inDB As VDatabase
mtblA As VTable
mtblB As VTable...

so i thought i would have created tablereferences and made them public 
for all other methods.
But when i want to use them e always get a nilobjectexception on my 
tablereferences.

what is wrong here? I have thought that this must work...
next step could be to define methods in main window and just call them 
from the new window but interaction between them seems to be ugly to me:

from newWindow, e.g. pushbutton action:
call mainWindow.methodA()

and method in mainwindow:

methodA()

// some dbqueries
.
.
call newWindow.methodB(resultFromMainWin)
end

So - which is the common way to use several windows using a valentinaDB?

thanks for help,
peter