c# Form Minimize/Maximize Buttons gone?

Question

On one of my forms the Minimize/Maximize Buttons are gone. The ControllBox is set to true as is the MaximizeBox and MinimizeBox.

Is there some other setting I have missed?

Are they not displayed or are they inactive, i.e. visible, but cannot be interacted with? — Codor, Feb 13 '17 at 14:11
it was the `FormBorderStyle` it was set to `SizableToolWindow` — Drago87, Feb 13 '17 at 14:29

score 3 · Accepted Answer · answered Feb 13 '17 at 14:12

3

Check your FormBorderStyle on that form,

FixedToolWindow and SizableToolWindow and None doesn't have those controls at all.

answered Feb 13 '17 at 14:12

madoxdev

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score 2 · Answer 2 · answered Feb 16 '21 at 21:48

Coming late to the game, I still would like to share my answer as I spent a good couple of hours searching for a fix. My form had all the properties set as they should, but still the minimize/maximize buttons wouldn't show.

The culprit was overriding the CreateParams method from my form, e.g.

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams Params = base.CreateParams;
            Params.ExStyle |= 0x80;
            return Params;
        }
    }

My original intention of overriding this method was to hide my app from the task switcher (alt-tab). I didn't think of this as the reason for not showing the buttons mentioned above, alas, it was.

For further reference, here is the documentation of the flags.

ewu11 · Answer 3 · 2022-03-25T07:29:50.583

In my project, the FormBorderStyle was already set to FixedSingle. So, I was not sure why the MinimizeBox/ MaximizeBox were still not visible. Then, somehow, I managed to find an alternative solution for this.

Inside of your C# project, simply press: Ctrl+Shift+F buttons, then search for the MinimizeBox/ MaximizeBox variables.

I was surprised to find its value set to False at first. So, to fix, I simply changed the value from False -> True then, problem solved.

In my case, since it is an open source project, the author has changed its value. So, I just need to find those variables using the Find in Files function by Microsoft Visual Studio. It can also be found in the Microsoft Visual Studio's menu bar: Edit -> Find and Replace -> Find in Files.

Hopefully useful for all of you as well!

c# Form Minimize/Maximize Buttons gone?

3 Answers3