Re: Multiple MDI Child Icons and Control Boxes Why??

From: Siv (msnewsgroups_at_removeme.sivill.com)
Date: 01/15/05 

Date: Sat, 15 Jan 2005 15:30:24 -0000

Nak,
I checked, all the other forms don't do anything in any of their closing
events. 

-- 
Siv
Martley, Near Worcester, UK.
"Nak" <a@a.com> wrote in message 
news:OthcH3w%23EHA.2700@TK2MSFTNGP14.phx.gbl...
> Hi Siv,
>
>    I've tried replicating your issue by making an MDI parent and 2 
> children.  In the MDI parent I have added a menu with 2 options, this is 
> the code that I have put in the form,
>
> Private Function showForm(ByVal iName As String) As Boolean
>    Dim frm As Form
>    For Each frm In Me.MdiChildren
>        If (frm.Name = iName) Then
>            frm.BringToFront()
>            Return (True)
>        End If
>    Next
> End Function
>
> Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As 
> System.EventArgs) Handles MenuItem2.Click
>    If (Not (showForm("Form2"))) Then
>        Dim pFrmForm1 As New Form2()
>        pFrmForm1.Name = "Form2"
>        pFrmForm1.MdiParent = Me
>        Call pFrmForm1.Show()
>    End If
> End Sub
>
> Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As 
> System.EventArgs) Handles MenuItem3.Click
>    If (Not (showForm("Form3"))) Then
>        Dim pFrmForm1 As New Form3()
>        pFrmForm1.Name = "Form3"
>        pFrmForm1.MdiParent = Me
>        Call pFrmForm1.Show()
>    End If
> End Sub
>
>    When either menu item is clicked the form is either created (if 
> showform returns false) or brought to the front.  No problems have occured 
> which make me think that you might have some code elsewhere causing the 
> issue, are you putting anything into the Closing events of the children? 
> I know I experienced a bug once with relation to the MDI child list in the 
> menu but I think this one can be resolved.  If you can post your code that 
> replicates this then please do, I'll take a look at it, other than that I 
> think you need to check your code.
>
> Nick.
>
> "Siv" <msnewsgroups@removeme.sivill.com> wrote in message 
> news:eViyhow%23EHA.1084@tk2msftngp13.phx.gbl...
> Hi,
> I have an MDI application that uses a generic "ShowPage" routine in a 
> module that is called when I want to display a child form.  The basic idea 
> is that in the module I have declared each form as follows:
>
> Friend F0 As frmMain
> Friend F1 As frmStart
> Friend F2 As frmSearch
> Then in my ShowPage routine (which is passed a string "pageToShow" which 
> is the name of the form I wish to open), I first check to see if we 
> already have an instance of the form open:
> For Each frm As Form In F0.MdiChildren
>    If frm.Name = pageToShow Then
>        frm.BringToFront()
>        Exit Function
>    End If
> Next
> If the form isn't already open the code carries on past the above and 
> opens a new instance of the form:
>
> Select Case pageToShow
>
>    Case "frmStart"
>        F1 = New frmStart
>        F1.MdiParent = F0
>        F1.Show()
>    Case "frmSearch"
>        F2 = New frmSearch
>        F2.MdiParent = F0
>        F2.Show()
>        F2.Activate()
>        F2.WindowState = FormWindowState.Maximized
> Etc ..
> I usually have a button at the bottom of each form that allows the user to 
> close it and return to the start page (this is an MDI child form that is 
> never closed whilst the app is running as it has a series of button that 
> access all the other forms on it.
> In the click event of the individual forms I have the following:
> Me.Close()
> F1.Activate()
> (F1 being the Start form).
> Now the problem.  Up to now I have had no problem with this method of 
> opening and closing forms.  Today I added a new form to the set and 
> configured it like all the others.  The problem is that when I close this 
> particular form and then re-open another form, its icon stays in the menu 
> bar along with the form just being opened and at the right hand end of the 
> menu bar I am getting multiple sets of min,max/restore,close buttons. The 
> more time I return to the Start Menu and open forms the more of these 
> additional control boxes appear almost filling the bar.  Clicking these 
> controls has no effect, or clicking the control menus at the left hand end 
> underneath the form icons doesn't do anything. It's as if these icons and 
> controls are now lost from their form.
> Does anyone know why this one form could have caused this behaviour?, I 
> have checked the form and compared all its non-default properties with the 
> ones that don't cause this behaviour and they all have the same settings.
> One thing I have also noticed is that when I return to the Start form, the 
> icon is usually the icon from the last form opened not the start form's 
> own icon.
> Siv
> Martley, Near Worcester, UK.
>