how to see second tabitem after clicking action button??

[nirgrahamuk]

at first it struck me that you hadn't formatted your code as code; so I have edited your post please read

FAQ: How to format your code

Formatting Code: the Basics All code or console output you include in your posts should be formatted properly. Luckily, this is very easy to do! Just use the code formatting button at the top of the post editing box: [image] Select some code Click the </> button! The code formatting button automatically adds special Markdown formatting symbols to whatever you selected. If you check the preview pane to the right of your post, you'll see that the forum software now outputs nicely formatted code . [04] The code formatting button is pretty smart! It can tell the difference between snippets of code that are part of a sentence and blocks of code that stand alone. …

with that out of the way, the colourising code formatting, makes it clear an obvious problem in your code
notice how the colour at the bottom is not the colour at the start...

@sgr308

actionButton('subm, 'Submit'))

there is no ' ending to 'subm