Hi everyone.

i had just started to learn VB and VS2008 and im doing some system due to my homework.

i made a WELCOME form with a timer, 5s to pass to the next form which called Select. After passed to next form, itll me.visible = false.

Theres 3 buttons on the Select form which call Customer, Staff and Exit. As i had just start, the button Customer will pass to a MDI menu call Customer Menu with a menu strip button called Quotation. Same, Select will me.visible = false when done.

Then a problem occured, i made a Quotation inside the Customer Menu, such as the mdiparent of Quotation is Customer. I expected that the Quotation button will disenable to press after i pressed that button. But i fail to do that. And the code below:

This is the code of MDI menu Customer Menu:

Public Class frmCustomer

Private Sub ExitToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ExitToolStripMenuItem.Click

    End

End Sub

Private Sub AboutUsToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AboutUsToolStripMenuItem.Click

    Dim frm As New AboutMamatai
    AboutMamatai.ShowDialog()

End Sub

Private Sub frmCustomer_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    frmQuotation.MdiParent = Me
    frmQuotation.Show()
    frmQuotation.Dock = DockStyle.Fill

    Me.Location = New Point(220, 180)

End Sub

Private Sub QuotationToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles QuotationToolStripMenuItem.Click

    frmQuotation.MdiParent = Me
    frmQuotation.Show()
    frmQuotation.Dock = DockStyle.Fill

End Sub

End Class

This is the code of the form inside the Customer menu:

Public Class frmQuotation

Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click

    frmCustomer.QuotationToolStripMenuItem.Enabled = True
    Me.Close()

End Sub

Private Sub frmQuotation_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    frmCustomer.QuotationToolStripMenuItem.Enabled = False

End Sub

End Class

When im tryin to solve this problem, i found that the problem may cause of the me.visible = false of the Select form and Welcome form. Becoz when i set the Customer Menu be the first form to run. The problem is not exist.

Is there anyone can help me ?

P.S. I guess if the other two forms code is needed so i post them also

This is the code of WELCOME form :

Public Class frmWELCOME

Private Sub frmWELCOME_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    Me.Location = New Point(270, 210)
    Timer1.Enabled = True

End Sub

Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick

    Timer1.Enabled = False
    Dim frm As New frmSelect
    frm.Show()
    Me.Visible = False


End Sub

Private Sub btnSkip_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSkip.Click

    Timer1.Enabled = False
    Dim frm As New frmSelect
    frm.Show()
    Me.Visible = False

End Sub

 End Class

This is the code of Select Form:

Public Class frmSelect

Private Sub btnCustomer_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCustomer.Click

    Dim frm As New frmCustomer
    frm.Show()
    Me.Visible = False

End Sub

Private Sub btnStaff_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStaff.Click

    Dim frm As New frmStaff
    frm.Show()
    Me.Visible = False

End Sub

Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click

    End

End Sub

Private Sub frmSelect_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    Me.Location = New Point(390, 250)

End Sub

End Class