Problem with icon on creating new maximized MDI child form in .NET

Question

I have a .NET 3.5 MDI WinForms application.

I set a a child form's Icon property, and the icon shows up correctly in the top left corner of the form. I then maximize the child form and the icon is still OK.

With the child form still maximized, I open another child window, which automatically comes up maximized. This form's icon is not the one in the Icon property, but the default .NET icon (the one with the blue, red, and yellow squares). However, if I resize the MDI parent form, the icon resets itself and displays properly.

Does anyone have a workaround or know why this happens?

Answer 1

Have you tried doing a .Refresh on the child window after opening it?

Answer 2

Hi,

I`ve found this problem too.

Have you tried doing a .Refresh on the child window after opening it? Ive tried to to it in the Form constructor but it doesnt help.

Have you found any solution?

Thanx

Answer 3

Right I have found a solution...

The workaround for this is to set the icon again on the load event of the child form as follows:

private void StatsForm_Load(object sender, EventArgs e)
{
    //bug that means you have to set the desired icon again otherwise it reverts to default when child form is maximised
    Icon = new System.Drawing.Icon("research.ico");
}

This does mean that you will have to first add the icon file in question into your VS project/solution and set it to "Copy Always" so that is copied when your solution is built.

HTH Calanus

Answer 4

I found that the only solution was to deactivate and then reactivate the MDI child:

document.Show();
// Work-around for error in WinForms that causes MDI children to be loaded with the default .NET icon when opened maximised.
ActivateMdiChild(null);
ActivateMdiChild(document);

This is the solution given in this reply on MSDN forums and it worked for me.

Answer 5

My solution: Leave the MdiChild "ShowIcon" property set to true, assign a 1x1 transparent icon. Problem solved.

Answer 6

It workied for me too/// ActivateMdiChild(null); ActivateMdiChild(document);

Answer 7

ActivateMdiChild(null); ActivateMdiChild(document);

This solution, already posted above, is much easier than setting the icon again on load and works perfectly.

Answer 8

The best workaround that I found to fix this issue is here.

aNewForm.FormBorderStyle = Windows.Forms.FormBorderStyle.FixedDialog
AddHandler aNewForm.SizeChanged, AddressOf Form_SizeChanged

aNewForm.Show()
aNewForm.WindowState = FormWindowState.Maximized

RemoveHandler aNewForm.SizeChanged, AddressOf Form_SizeChanged

the handler

Protected Sub Form_SizeChanged(ByVal sender As Object, ByVal e As EventArgs)

    If WindowState = FormWindowState.Maximized Then
        If FormBorderStyle <> FormBorderStyle.Sizable Then FormBorderStyle = FormBorderStyle.Sizable
    End If

End Sub

Answer 9

form.WindowState = FormWindowState.Normal

form.Show()

form.WindowState = FormWindowState.Maximized

form.Show()

solve my problem!