vb.net mdi child title bar not hiding

Tuesday, July 8, 2014

I have an issue hiding the title bar of a mdi child form in maximized state within a mdi parent form in .NET.


Here's what I have at design & run time: Screenshot


Here is the new() of my MDI child form:



Public Sub New(ByRef pParent As Form)
MyBase.New()
Me.MdiParent = pParent
fParent = pParent
Me.Text = ""
Me.FormBorderStyle = Windows.Forms.FormBorderStyle.None
Me.WindowState = FormWindowState.Normal
Me.MinimizeBox = False
Me.MaximizeBox = False
Me.ControlBox = False
Me.ShowIcon = False
Me.ShowInTaskbar = False
Me.SizeGripStyle = Windows.Forms.SizeGripStyle.Hide
Me.Dock = DockStyle.Fill
End Sub


I've tried FormWindowState.Maximized and DockStyle.None instead but the result was the same.


On the parent container, to change from a child to another I use this function:



Protected Sub SetActiveScreen(ByVal pChildForm As tWizardForm)
If pChildForm Is Nothing Then Exit Sub
If fActiveScreen Is pChildForm Then Exit Sub

Dim hg As New tHourglass
Try
fActiveScreen = pChildForm
fActiveScreen.Show()
fActiveScreen.BringToFront()
For Each aForm In MdiChildren
If aForm IsNot fActiveScreen Then aForm.Hide()
Next
fActiveScreen.Execute()
UpdateCaption()
Catch
Finally
hg.Dispose()
End Try
End Sub


At design I've set the parent property IsMdiContainer = True.


Where did I go wrong or what have I missed ? Plus this kind of double buttons on the child title bar is really strange. When I click one of the maximize buttons I end up with the same result: Screenshot. The resulting title bar buttons cannot be clicked.


Thank you for any help !







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