mdi child problem

GaryKoh

hi.. i have make 3 forms 1 mdi parent and 2 mdi child calling a child to show at parent is easy but hoow to make a child call another child and show it in the parent? this is basically how it look like.. form1(parent) call form2(child)....form2 show in form1 form2(child) call form3(child).....form3 show in form1 i try to code the button in form2 like so Dim frm3 as New Form3 Dim frm1 as New Form1 frm3.mdiparent = frm1 frm3.show which is not working...am i doing it wrong? please help me...thank you in adnvace Gary

OICU812

Try this:

Public Class Form1

Private Sub Form1\_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim frm2 As New Form2
    frm2.MdiParent = Me
    frm2.Show()
End Sub

End Class

Public Class Form2

Private Sub Button1\_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim frm3 As New Form3
    frm3.MdiParent = Me.ParentForm
    frm3.Show()
End Sub

End Class

GaryKoh

tried....but this error show up An unhandled exception of type 'System.NullReferenceException' occurred in WindowsApplication7.exe Additional information: Object reference not set to an instance of an object. and still unable to show the second child Gary

Robert Rohde

Try Owner instead of ParentForm. ParentForm gets the form on which a control is placed. Owner should get (if I remember right) the owning form of a child form.

OICU812

I'm sorry Gary, I tested my previous example on VisualBasic 2005 Beta and it works there. You're right it does produce an error on my VS 2003. I tested this on VS 2003 and it works.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim frm3 As New Form3
frm3.MdiParent = Me.MdiParent
frm3.Show()
End Sub

GaryKoh

Thanks OIC is working now thank for all the help....both of u thank you Gary