MDI form confusion

Hi guys,
I have a little problem when creating MDI style in VB.NET. In the MDIcontainer form (Form1) , I put a button and in its click event I wrote these codes:

dim frmchild as New form2
frmchild.MDIParent = Me
frmchild.Show()

OK, then the MDIChild showed up...No problemo...it run well. But when I click the button again, another MDIChild form showed in the MDIContainer form...again and again. Is there a way to stop the MDIChild from keep on showing ?

THX

Private frm as form




In the button click event ....
if frm is nothing then
frm = new myform
frm.MDIParent = me
frm.show()
endif

Hi Bryan,
there's a new problem...
when I close the MDIChild form and
try to show it again by clicking the button
in the MDIContainer, the MDIChild form
never shows up...weird isn't it?

When you close the form you should set the reference to nothing so that it can re-enter the if statement. ie


frm.close()
frm = nothing