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...all I want to do is create a base class form, and derive a bunch of others from it - the idea being to have a base which has the "general layout" and a bunch of buttons that will be on all forms.
And the first problem is that you can't use a static ImageList for all the buttons.
And an Imagelist is the only way to use my .ICO file as button images.
After going round that for a while (including a perfect looking article here: Sharing and inheriting ImageLists across multiple forms and controls[^] which sounds perfect but doesn't work with VS2019 and I'd had enough of trying by then) I relent and find an online resource that extracts PNG images form Icons.
Except they are all too big at 256x256 and the ICO files don't have the right 64x64 images, just 256x256 and 48x48 and smaller. 
OK ... Corel Paintshop Pro has a batch mode ... finally get that working, import the PNG files, apply, presto! Base form is working.
Derive a new form. try to view it in the designer ... "Object reference not set to an instance". Find the reason, add the necessary "if design mode", try again.
"System.Windows.Forms.Design.IEventHandlerService already exists in the service container. Parameter name: serviceType" 
Finally fix it: change the derived form type to "Form", build, view in the designer. Hurrah! No error (or buttons but hey!). Change it back to Base Form. Build. View in the designer.
And it works.
Sodding Visual Studio.
And it's only Tuesday. I am sooooo glad I didn't make the base form abstract ... I'll do that when its' all working. Deriving a concrete class from an abstract UserControl[^] applies to Forms as well.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Not meaning to pick nits, but doesn't 'going round and round' imply circles  
Thar's only two possibilities: Thar is life out there in the universe which is smarter than we are, or we're the most intelligent life in the universe. Either way, it's a mighty sobering thought. (Porkypine - via Walt Kelly)
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Not meaning to nit pick, but the Earth goes round and round in an elliptical orbit 
// TODO: Insert something here Top ten reasons why I'm lazy
1.
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May I recommend Axialis Icon Workshop. It can convert icons to all of the different graphics formats in all of the different sizes. I have no connection to the company.
The difficult we do right away...
...the impossible takes slightly longer.
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More fitting music, RATT - Round And Round[^]. 
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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OriginalGriff wrote: extracts PNG images form Icons
... or just use Paint, Resize, SaveAs .png
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All 93 of them ...
I did consider it, but I wanted an "automated" solution to prevent RSI
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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For those who can't (or won't) afford PSP, IrfanView has a nifty batch converter.
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Too much time to waste in images/icons! 
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What framework version are you using? The .NET Core / 5 WinForms designer doesn’t work correctly with custom control designers. You’ll need to multitarget to a regular framework version (e.g. 4.8) for the designers to work.
What do you get when you cross a joke with a rhetorical question?
The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.
Do questions with multiple question marks annoy you???
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I would have done it like this:
Create panels or usercontrols containing common elements. Drag those onto each form. It's not perfect, but in my experience doing what you're doing using form inheritance causes more problems than it solves.
Just my take on things. *hides*
Real programmers use butterflies
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In a dad-a-base, of course.
I'd tell you where my bad jokes are stored, but I'd have to get your coat too.
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Dada-boom!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Beat me to it. 
Software Zen: delete this;
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Hehe, thank you for that one
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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I was so inspired by my fellow dad, that I named it after him. I use "Jason Format" in my database.
Hogan
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snorkie wrote: I use "Jason Format" in my database.
Formatting done with a machete? 
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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Never argue with a fool. Onlookers may not be able to tell the difference.
Mark Twain
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Voorhees a jolly good fellow!
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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This is so straight forward that I wondered how come I have never heard it before. Nice !
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Not a dad-a-lake? And beyond 50 years it's dad-a-leak?
In Word you can only store 2 bytes. That is why I use Writer.
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I got a negative result.
How do you do that with only two multiple choice answers?
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I was positive I would pass, but it didn't happen.
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