How do you select a multipage tab without a mouse click?

I have a userform that has a multipage with two tabs.

I have set the TabIndex of all of the controls on the userfrom. given the layout of each tab the userform is coded to change size depending on the tab selected. (this works with a mouse click)

If the user cycles through the controls with tab key and highlights the multipage tab and then presses the arrow key to change the tab the userform does not change size.

How do I trap for the arrow keys if one of the multipage tabs has been highlighted?

I want to run my sizing code if the user has highlighted the multipage tab and then pressed the left or right arrow keys.

I suppose I could add a scrollbar.
The reason I didn't is because I have a listbox near the top of the second page and a series of textbox fields below where the user adds data, and the user needs to see the listbox.
I could also just size my userform for the larger page, but there would be a lot of empty space on the first page if I do that, and it just doesn't look good.

I am using a change even to check for a mouse click on the multipage tabs.

from the userform code

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module code

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The custom variables used on the page1 case are set at the userform initialize

Using the change event works!!!
The userform now changes size if you arrow left or right.

I had to change the userform code. You forgot to make it a change event.

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Thank you very much for your help with this problem.
I had tried a change even but it would not work. After looking at your code I realized that I was not passing any values to "SetUserFromSize" when I originally tried the change event.